From d596861a2e9a1c6af4d8c6133c9b300a21d87664 Mon Sep 17 00:00:00 2001
From: marc <marc@sastre.cat>
Date: Sun, 23 Mar 2025 21:46:04 +0100
Subject: [PATCH] Migrated links, lyrics and properties

---
 flake.nix                                     |   1 +
 folkugat_web/api/tema/__init__.py             |   2 +-
 folkugat_web/api/tema/editor.py               |  75 ------
 folkugat_web/api/tema/index.py                | 209 ++-------------
 folkugat_web/api/tema/links.py                | 160 ++++++++++++
 folkugat_web/api/tema/lyrics.py               |  80 ++++++
 folkugat_web/api/tema/properties.py           |  73 ++++++
 .../templates/fragments/pdf_viewer.html       |   3 +
 .../templates/fragments/tema/editor/link.html |   4 +-
 .../fragments/tema/editor/link_file.html      |   6 +-
 .../fragments/tema/editor/link_url.html       |   8 +-
 .../fragments/tema/editor/lyric.html          |   6 +-
 .../fragments/tema/editor/property.html       |   4 +-
 .../assets/templates/fragments/tema/link.html |   4 +-
 .../templates/fragments/tema/links.html       |   2 +-
 .../templates/fragments/tema/lyric.html       |   4 +-
 .../templates/fragments/tema/property.html    |   4 +-
 folkugat_web/dal/sql/_connection.py           |   3 +-
 folkugat_web/dal/sql/playlists/ddl.py         |   6 -
 folkugat_web/dal/sql/sessions/ddl.py          |   6 -
 folkugat_web/dal/sql/temes/conversion.py      |  28 +-
 folkugat_web/dal/sql/temes/ddl.py             |  57 ++++-
 folkugat_web/dal/sql/temes/links.py           | 137 ++++++++++
 folkugat_web/dal/sql/temes/lyrics.py          | 127 ++++++++++
 folkugat_web/dal/sql/temes/properties.py      | 127 ++++++++++
 folkugat_web/dal/sql/temes/query.py           |   3 +-
 folkugat_web/dal/sql/temes/write.py           |  29 ++-
 folkugat_web/fragments/tema.py                | 239 ------------------
 folkugat_web/fragments/tema/__init__.py       |  84 ++++++
 folkugat_web/fragments/tema/links.py          |  88 +++++++
 folkugat_web/fragments/tema/lyrics.py         |  25 ++
 folkugat_web/fragments/tema/properties.py     |  27 ++
 folkugat_web/fragments/temes.py               |  17 +-
 folkugat_web/model/__init__.py                |   3 -
 folkugat_web/model/_base.py                   |  39 ---
 folkugat_web/model/temes.py                   |  79 +-----
 folkugat_web/services/files.py                |   2 +-
 folkugat_web/services/temes/links.py          |  29 ++-
 folkugat_web/services/temes/lyrics.py         |  30 +++
 folkugat_web/services/temes/properties.py     |  30 +++
 folkugat_web/services/temes/search.py         |  79 ++++--
 folkugat_web/services/temes/write.py          | 128 +---------
 folkugat_web/typing.py                        |   2 +-
 folkugat_web/utils.py                         |  29 ++-
 scripts/00_migrate_links.py                   |  53 ++++
 scripts/01_migrate_lyrics.py                  |  48 ++++
 scripts/02_migrate_properties.py              |  48 ++++
 47 files changed, 1403 insertions(+), 844 deletions(-)
 create mode 100644 folkugat_web/api/tema/links.py
 create mode 100644 folkugat_web/api/tema/lyrics.py
 create mode 100644 folkugat_web/api/tema/properties.py
 create mode 100644 folkugat_web/dal/sql/temes/links.py
 create mode 100644 folkugat_web/dal/sql/temes/lyrics.py
 create mode 100644 folkugat_web/dal/sql/temes/properties.py
 delete mode 100644 folkugat_web/fragments/tema.py
 create mode 100644 folkugat_web/fragments/tema/__init__.py
 create mode 100644 folkugat_web/fragments/tema/links.py
 create mode 100644 folkugat_web/fragments/tema/lyrics.py
 create mode 100644 folkugat_web/fragments/tema/properties.py
 delete mode 100644 folkugat_web/model/_base.py
 create mode 100644 folkugat_web/services/temes/lyrics.py
 create mode 100644 folkugat_web/services/temes/properties.py
 create mode 100644 scripts/00_migrate_links.py
 create mode 100644 scripts/01_migrate_lyrics.py
 create mode 100644 scripts/02_migrate_properties.py

diff --git a/flake.nix b/flake.nix
index 55de1c8..c3cadb8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -59,6 +59,7 @@
 
         shellHook = ''
           export PYTHONPATH=${pythonEnv}/${python.sitePackages}:$PYTHONPATH
+          export PYTHONPATH=$(pwd):$PYTHONPATH
         '';
       };
     });
diff --git a/folkugat_web/api/tema/__init__.py b/folkugat_web/api/tema/__init__.py
index aba1bbe..962bbf4 100644
--- a/folkugat_web/api/tema/__init__.py
+++ b/folkugat_web/api/tema/__init__.py
@@ -1 +1 @@
-from . import editor, index
+from . import editor, index, links, lyrics, properties
diff --git a/folkugat_web/api/tema/editor.py b/folkugat_web/api/tema/editor.py
index 4ae8578..1fa193c 100644
--- a/folkugat_web/api/tema/editor.py
+++ b/folkugat_web/api/tema/editor.py
@@ -11,78 +11,3 @@ def title_editor(
     tema_id: int,
 ):
     return tema.title_editor(request=request, logged_in=logged_in, tema_id=tema_id)
-
-
-@router.get("/api/tema/{tema_id}/editor/lyric/{lyric_id}")
-def lyric_editor(
-    request: Request,
-    logged_in: auth.RequireLogin,
-    tema_id: int,
-    lyric_id: int,
-):
-    return tema.lyric_editor(
-        request=request,
-        logged_in=logged_in,
-        tema_id=tema_id,
-        lyric_id=lyric_id,
-    )
-
-
-@router.get("/api/tema/{tema_id}/editor/link/{link_id}")
-def link_editor(
-    request: Request,
-    logged_in: auth.RequireLogin,
-    tema_id: int,
-    link_id: int,
-):
-    return tema.link_editor(
-        request=request,
-        logged_in=logged_in,
-        tema_id=tema_id,
-        link_id=link_id,
-    )
-
-
-@router.get("/api/tema/{tema_id}/editor/link/{link_id}/url")
-def link_editor_url_input(
-    request: Request,
-    logged_in: auth.RequireLogin,
-    tema_id: int,
-    link_id: int,
-):
-    return tema.link_editor_url(
-        request=request,
-        logged_in=logged_in,
-        tema_id=tema_id,
-        link_id=link_id,
-    )
-
-
-@router.get("/api/tema/{tema_id}/editor/link/{link_id}/file")
-def link_editor_file_input(
-    request: Request,
-    logged_in: auth.RequireLogin,
-    tema_id: int,
-    link_id: int,
-):
-    return tema.link_editor_file(
-        request=request,
-        logged_in=logged_in,
-        tema_id=tema_id,
-        link_id=link_id,
-    )
-
-
-@router.get("/api/tema/{tema_id}/editor/property/{property_id}")
-def property_editor(
-    request: Request,
-    logged_in: auth.RequireLogin,
-    tema_id: int,
-    property_id: int,
-):
-    return tema.property_editor(
-        request=request,
-        logged_in=logged_in,
-        tema_id=tema_id,
-        property_id=property_id,
-    )
diff --git a/folkugat_web/api/tema/index.py b/folkugat_web/api/tema/index.py
index b6984d2..d73fd19 100644
--- a/folkugat_web/api/tema/index.py
+++ b/folkugat_web/api/tema/index.py
@@ -1,15 +1,18 @@
 from typing import Annotated
 
-from fastapi import Request, UploadFile
-from fastapi.params import File, Form, Param
+from fastapi import HTTPException, Request
+from fastapi.params import Form
 from fastapi.responses import HTMLResponse
 from folkugat_web.api import router
 from folkugat_web.fragments import tema, temes
-from folkugat_web.model import temes as model
-from folkugat_web.services import auth, files
+from folkugat_web.services import auth
+from folkugat_web.services.temes import links as links_service
+from folkugat_web.services.temes import lyrics as lyrics_service
+from folkugat_web.services.temes import properties as properties_service
+from folkugat_web.services.temes import query as temes_q
 from folkugat_web.services.temes import write as temes_w
-from folkugat_web.services.temes.links import guess_link_type
 from folkugat_web.templates import templates
+from folkugat_web.utils import FnChain
 
 
 @router.get("/tema/{tema_id}")
@@ -27,7 +30,17 @@ def page(request: Request, logged_in: auth.LoggedIn, tema_id: int):
 
 @router.get("/api/tema/{tema_id}")
 def contingut(request: Request, logged_in: auth.LoggedIn, tema_id: int):
-    return temes.tema(request, tema_id, logged_in)
+    tema = temes_q.get_tema_by_id(tema_id)
+    if not tema:
+        raise HTTPException(status_code=404, detail="Could not find tune")
+    tema = (
+        FnChain.transform(tema) |
+        temes_q.tema_compute_stats |
+        links_service.add_links_to_tema |
+        lyrics_service.add_lyrics_to_tema |
+        properties_service.add_properties_to_tema
+    ).result()
+    return temes.tema(request, logged_in, tema)
 
 
 @router.delete("/api/tema/{tema_id}")
@@ -62,190 +75,6 @@ def set_title(
     return tema.title(request=request, tema=new_tema, logged_in=logged_in)
 
 
-@router.get("/api/tema/{tema_id}/lyric/{lyric_id}")
-def lyric(request: Request, logged_in: auth.LoggedIn, tema_id: int, lyric_id: int):
-    return tema.lyric(request=request, logged_in=logged_in, tema_id=tema_id, lyric_id=lyric_id)
-
-
-@router.put("/api/tema/{tema_id}/lyric/{lyric_id}")
-def set_lyric(
-    request: Request,
-    logged_in: auth.RequireLogin,
-    tema_id: int,
-    lyric_id: int,
-    title: Annotated[str, Form()],
-    lyric: Annotated[str, Form()],
-):
-    new_lyric = model.Lyrics(id=lyric_id, title=title, content=lyric.strip())
-    _ = temes_w.update_lyric(tema_id=tema_id, lyric_id=lyric_id, lyric=new_lyric)
-    return tema.lyric(request=request, logged_in=logged_in, tema_id=tema_id, lyric_id=lyric_id)
-
-
-@router.post("/api/tema/{tema_id}/lyric")
-def add_lyric(
-    request: Request,
-    logged_in: auth.RequireLogin,
-    tema_id: int,
-):
-    new_tema = temes_w.add_lyric(tema_id=tema_id)
-    lyric_id = new_tema.lyrics[-1].id
-    if lyric_id is None:
-        raise RuntimeError("Invalid lyric_id on newly created lyric!")
-    return tema.lyric_editor(
-        request=request,
-        logged_in=logged_in,
-        tema_id=tema_id,
-        lyric_id=lyric_id,
-    )
-
-
-@router.delete("/api/tema/{tema_id}/lyric/{lyric_id}")
-def delete_lyric(
-    tema_id: int,
-    lyric_id: int,
-):
-    _ = temes_w.delete_lyric(tema_id=tema_id, lyric_id=lyric_id)
-    return HTMLResponse()
-
-
-@router.get("/api/tema/{tema_id}/link/{link_id}")
-def link(request: Request, logged_in: auth.LoggedIn, tema_id: int, link_id: int):
-    return tema.link(request=request, logged_in=logged_in, tema_id=tema_id, link_id=link_id)
-
-
-@router.put("/api/tema/{tema_id}/link/{link_id}")
-async def set_link(
-    request: Request,
-    logged_in: auth.RequireLogin,
-    tema_id: int,
-    link_id: int,
-    content_type: Annotated[model.ContentType, Form()],
-    title: Annotated[str | None, Form()] = None,
-    url: Annotated[str | None, Form()] = None,
-    upload_file: Annotated[UploadFile | None, File()] = None,
-):
-    if upload_file:
-        url = await files.store_file(tema_id=tema_id, upload_file=upload_file)
-
-    link_type = guess_link_type(url or '')
-    new_link = model.Link(
-        id=link_id,
-        content_type=content_type,
-        link_type=link_type,
-        url=url or '',
-        title=title or '',
-    )
-    _ = temes_w.update_link(tema_id=tema_id, link_id=link_id, link=new_link)
-    return tema.link(request=request, logged_in=logged_in, tema_id=tema_id, link_id=link_id)
-
-
-@router.post("/api/tema/{tema_id}/link")
-def add_link(
-    request: Request,
-    logged_in: auth.RequireLogin,
-    tema_id: int,
-):
-    new_tema = temes_w.add_link(tema_id=tema_id)
-    link_id = new_tema.links[-1].id
-    if link_id is None:
-        raise RuntimeError("Invalid link_id on newly created link!")
-    return tema.link_editor(
-        request=request,
-        logged_in=logged_in,
-        tema_id=tema_id,
-        link_id=link_id,
-    )
-
-
-@router.delete("/api/tema/{tema_id}/link/{link_id}")
-def delete_link(
-    _: auth.RequireLogin,
-    tema_id: int,
-    link_id: int,
-):
-    _tema = temes_w.delete_link(tema_id=tema_id, link_id=link_id)
-    return HTMLResponse(
-        headers={
-            "HX-Trigger": f"reload-tema-{tema_id}-score"
-        }
-    )
-
-
-@router.get("/api/tema/{tema_id}/link/{link_id}/icon")
-def link_icon(
-    request: Request,
-    logged_in: auth.LoggedIn,
-    tema_id: int,
-    link_id: int,
-    content_type: Annotated[model.ContentType, Param()],
-    url: Annotated[str, Param()],
-):
-    return tema.link_icon(
-        request=request,
-        logged_in=logged_in,
-        tema_id=tema_id,
-        link_id=link_id,
-        url=url,
-        content_type=content_type,
-    )
-
-
-@router.get("/api/tema/{tema_id}/score")
-def get_score(
-    request: Request,
-    logged_in: auth.LoggedIn,
-    tema_id: int,
-):
-    return tema.score(
-        request=request,
-        logged_in=logged_in,
-        tema_id=tema_id,
-    )
-
-
-@router.get("/api/tema/{tema_id}/property/{property_id}")
-def property_(request: Request, logged_in: auth.LoggedIn, tema_id: int, property_id: int):
-    return tema.property_(request=request, logged_in=logged_in, tema_id=tema_id, property_id=property_id)
-
-
-@router.put("/api/tema/{tema_id}/property/{property_id}")
-def set_property(
-    request: Request,
-    logged_in: auth.RequireLogin,
-    tema_id: int,
-    property_id: int,
-    field: Annotated[model.PropertyField, Form()],
-    value: Annotated[str, Form()],
-):
-    new_property = model.Property(id=property_id, field=field, value=value.strip())
-    _ = temes_w.update_property(tema_id=tema_id, property_id=property_id, prop=new_property)
-    return tema.property_(request=request, logged_in=logged_in, tema_id=tema_id, property_id=property_id)
-
-
-@router.post("/api/tema/{tema_id}/property")
-def add_property(
-    request: Request,
-    logged_in: auth.RequireLogin,
-    tema_id: int,
-):
-    new_tema = temes_w.add_property(tema_id=tema_id)
-    property_id = new_tema.properties[-1].id
-    if property_id is None:
-        raise RuntimeError("Invalid property_id on newly created property!")
-    return tema.property_editor(
-        request=request,
-        logged_in=logged_in,
-        tema_id=tema_id,
-        property_id=property_id,
-    )
-
-
-@router.delete("/api/tema/{tema_id}/property/{property_id}")
-def delete_property(_: auth.RequireLogin, tema_id: int, property_id: int):
-    _tema = temes_w.delete_property(tema_id=tema_id, property_id=property_id)
-    return HTMLResponse()
-
-
 @router.put("/api/tema/{tema_id}/visible")
 def set_visible(request: Request, logged_in: auth.RequireLogin, tema_id: int):
     new_tema = temes_w.set_visibility(tema_id=tema_id, hidden=False)
diff --git a/folkugat_web/api/tema/links.py b/folkugat_web/api/tema/links.py
new file mode 100644
index 0000000..34b1262
--- /dev/null
+++ b/folkugat_web/api/tema/links.py
@@ -0,0 +1,160 @@
+from typing import Annotated
+
+from fastapi import HTTPException, Request, UploadFile
+from fastapi.params import File, Form, Param
+from fastapi.responses import HTMLResponse
+from folkugat_web.api import router
+from folkugat_web.fragments.tema import links as links_fragments
+from folkugat_web.model import temes as model
+from folkugat_web.services import auth, files
+from folkugat_web.services.temes import links as links_service
+
+
+@router.get("/api/tema/{tema_id}/link/{link_id}")
+def link(request: Request, logged_in: auth.LoggedIn, tema_id: int, link_id: int):
+    link = links_service.get_link_by_id(link_id=link_id, tema_id=tema_id)
+    if not link:
+        raise HTTPException(status_code=404, detail="Could not find link!")
+    return links_fragments.link(request=request, logged_in=logged_in, link=link)
+
+
+@router.put("/api/tema/{tema_id}/link/{link_id}")
+async def set_link(
+    request: Request,
+    logged_in: auth.RequireLogin,
+    tema_id: int,
+    link_id: int,
+    content_type: Annotated[model.ContentType, Form()],
+    title: Annotated[str | None, Form()] = None,
+    url: Annotated[str | None, Form()] = None,
+    upload_file: Annotated[UploadFile | None, File()] = None,
+):
+    if upload_file:
+        url = await files.store_file(tema_id=tema_id, upload_file=upload_file)
+
+    link_type = links_service.guess_link_type(url or '')
+    new_link = model.Link(
+        id=link_id,
+        tema_id=tema_id,
+        content_type=content_type,
+        link_type=link_type,
+        url=(url or '').strip(),
+        title=(title or '').strip(),
+    )
+    links_service.update_link(link=new_link)
+    return links_fragments.link(request=request, logged_in=logged_in, link=new_link)
+
+
+@router.post("/api/tema/{tema_id}/link")
+def create_link(
+    request: Request,
+    logged_in: auth.RequireLogin,
+    tema_id: int,
+):
+    link = links_service.create_link(tema_id=tema_id)
+    return links_fragments.link_editor(
+        request=request,
+        logged_in=logged_in,
+        link=link,
+    )
+
+
+@router.delete("/api/tema/{tema_id}/link/{link_id}")
+def delete_link(
+    _logged_in: auth.RequireLogin,
+    tema_id: int,
+    link_id: int,
+):
+    links_service.delete_link(link_id=link_id, tema_id=tema_id)
+    return HTMLResponse(
+        headers={
+            "HX-Trigger": f"reload-tema-{tema_id}-score"
+        }
+    )
+
+
+@router.get("/api/tema/{tema_id}/link/{link_id}/icon")
+def link_icon(
+    request: Request,
+    logged_in: auth.LoggedIn,
+    tema_id: int,
+    link_id: int,
+    content_type: Annotated[model.ContentType, Param()],
+    url: Annotated[str, Param()],
+):
+    link = model.Link(
+        id=link_id,
+        tema_id=tema_id,
+        content_type=content_type,
+        link_type=links_service.guess_link_type(url),
+        url=url,
+    )
+    return links_fragments.link_icon(
+        request=request,
+        logged_in=logged_in,
+        link=link,
+    )
+
+
+@router.get("/api/tema/{tema_id}/score")
+def get_score(
+    request: Request,
+    logged_in: auth.LoggedIn,
+    tema_id: int,
+):
+    return links_fragments.score(
+        request=request,
+        logged_in=logged_in,
+        tema_id=tema_id,
+    )
+
+
+@router.get("/api/tema/{tema_id}/editor/link/{link_id}")
+def link_editor(
+    request: Request,
+    logged_in: auth.RequireLogin,
+    tema_id: int,
+    link_id: int,
+):
+    link = links_service.get_link_by_id(link_id=link_id, tema_id=tema_id)
+    if not link:
+        raise HTTPException(status_code=404, detail="Could not find link!")
+    return links_fragments.link_editor(
+        request=request,
+        logged_in=logged_in,
+        link=link,
+    )
+
+
+@router.get("/api/tema/{tema_id}/editor/link/{link_id}/url")
+def link_editor_url_input(
+    request: Request,
+    logged_in: auth.RequireLogin,
+    tema_id: int,
+    link_id: int,
+):
+    link = links_service.get_link_by_id(link_id=link_id, tema_id=tema_id)
+    if not link:
+        raise HTTPException(status_code=404, detail="Could not find link!")
+    return links_fragments.link_editor_url(
+        request=request,
+        logged_in=logged_in,
+        link=link,
+    )
+
+
+@router.get("/api/tema/{tema_id}/editor/link/{link_id}/file")
+def link_editor_file_input(
+    request: Request,
+    logged_in: auth.RequireLogin,
+    tema_id: int,
+    link_id: int,
+):
+    link = links_service.get_link_by_id(link_id=link_id, tema_id=tema_id)
+    if not link:
+        raise HTTPException(status_code=404, detail="Could not find link!")
+    return links_fragments.link_editor_file(
+        request=request,
+        logged_in=logged_in,
+        link=link,
+    )
diff --git a/folkugat_web/api/tema/lyrics.py b/folkugat_web/api/tema/lyrics.py
new file mode 100644
index 0000000..26ef07d
--- /dev/null
+++ b/folkugat_web/api/tema/lyrics.py
@@ -0,0 +1,80 @@
+import dataclasses
+from typing import Annotated
+
+from fastapi import HTTPException, Request
+from fastapi.params import Form
+from fastapi.responses import HTMLResponse
+from folkugat_web.api import router
+from folkugat_web.fragments.tema import lyrics as lyrics_fragments
+from folkugat_web.services import auth
+from folkugat_web.services.temes import lyrics as lyrics_service
+
+
+@router.get("/api/tema/{tema_id}/lyric/{lyric_id}")
+def lyric(
+    request: Request,
+    logged_in: auth.LoggedIn,
+    tema_id: int,
+    lyric_id: int,
+):
+    lyric = lyrics_service.get_lyric_by_id(lyric_id=lyric_id, tema_id=tema_id)
+    if not lyric:
+        raise HTTPException(status_code=404, detail="Could not find lyric!")
+    return lyrics_fragments.lyric(request=request, logged_in=logged_in, lyric=lyric)
+
+
+@router.put("/api/tema/{tema_id}/lyric/{lyric_id}")
+def set_lyric(
+    request: Request,
+    logged_in: auth.RequireLogin,
+    tema_id: int,
+    lyric_id: int,
+    title: Annotated[str, Form()],
+    content: Annotated[str, Form()],
+):
+    lyric = lyrics_service.get_lyric_by_id(lyric_id=lyric_id, tema_id=tema_id)
+    if not lyric:
+        raise HTTPException(status_code=404, detail="Could not find lyric!")
+    new_lyric = dataclasses.replace(lyric, title=title, content=content.strip())
+    lyrics_service.update_lyric(lyric=new_lyric)
+    return lyrics_fragments.lyric(request=request, logged_in=logged_in, lyric=new_lyric)
+
+
+@router.post("/api/tema/{tema_id}/lyric")
+def add_lyric(
+    request: Request,
+    logged_in: auth.RequireLogin,
+    tema_id: int,
+):
+    lyric = lyrics_service.create_lyric(tema_id=tema_id)
+    return lyrics_fragments.lyric_editor(
+        request=request,
+        logged_in=logged_in,
+        lyric=lyric,
+    )
+
+
+@router.delete("/api/tema/{tema_id}/lyric/{lyric_id}")
+def delete_lyric(
+    tema_id: int,
+    lyric_id: int,
+):
+    lyrics_service.delete_lyric(lyric_id=lyric_id, tema_id=tema_id)
+    return HTMLResponse()
+
+
+@router.get("/api/tema/{tema_id}/editor/lyric/{lyric_id}")
+def lyric_editor(
+    request: Request,
+    logged_in: auth.RequireLogin,
+    tema_id: int,
+    lyric_id: int,
+):
+    lyric = lyrics_service.get_lyric_by_id(lyric_id=lyric_id, tema_id=tema_id)
+    if not lyric:
+        raise HTTPException(status_code=404, detail="Could not find lyric!")
+    return lyrics_fragments.lyric_editor(
+        request=request,
+        logged_in=logged_in,
+        lyric=lyric,
+    )
diff --git a/folkugat_web/api/tema/properties.py b/folkugat_web/api/tema/properties.py
new file mode 100644
index 0000000..7a45637
--- /dev/null
+++ b/folkugat_web/api/tema/properties.py
@@ -0,0 +1,73 @@
+import dataclasses
+from typing import Annotated
+
+from fastapi import HTTPException, Request
+from fastapi.params import Form
+from fastapi.responses import HTMLResponse
+from folkugat_web.api import router
+from folkugat_web.fragments.tema import properties as properties_fragments
+from folkugat_web.model import temes as model
+from folkugat_web.services import auth
+from folkugat_web.services.temes import properties as properties_service
+
+
+@router.get("/api/tema/{tema_id}/property/{property_id}")
+def property_(request: Request, logged_in: auth.LoggedIn, tema_id: int, property_id: int):
+    property = properties_service.get_property_by_id(property_id=property_id, tema_id=tema_id)
+    if not property:
+        raise HTTPException(status_code=404, detail="Could not find lyric!")
+    return properties_fragments.property_(request=request, logged_in=logged_in, property=property)
+
+
+@router.put("/api/tema/{tema_id}/property/{property_id}")
+def set_property(
+    request: Request,
+    logged_in: auth.RequireLogin,
+    tema_id: int,
+    property_id: int,
+    field: Annotated[model.PropertyField, Form()],
+    value: Annotated[str, Form()],
+):
+    property = properties_service.get_property_by_id(property_id=property_id, tema_id=tema_id)
+    if not property:
+        raise HTTPException(status_code=404, detail="Could not find lyric!")
+    new_property = dataclasses.replace(property, field=field, value=value.strip())
+    properties_service.update_property(property=new_property)
+    return properties_fragments.property_(request=request, logged_in=logged_in, property=new_property)
+
+
+@router.post("/api/tema/{tema_id}/property")
+def add_property(
+    request: Request,
+    logged_in: auth.RequireLogin,
+    tema_id: int,
+):
+    property = properties_service.create_property(tema_id=tema_id)
+    return properties_fragments.property_editor(
+        request=request,
+        logged_in=logged_in,
+        property=property,
+    )
+
+
+@router.delete("/api/tema/{tema_id}/property/{property_id}")
+def delete_property(_: auth.RequireLogin, tema_id: int, property_id: int):
+    properties_service.delete_property(property_id=property_id, tema_id=tema_id)
+    return HTMLResponse()
+
+
+@router.get("/api/tema/{tema_id}/editor/property/{property_id}")
+def property_editor(
+    request: Request,
+    logged_in: auth.RequireLogin,
+    tema_id: int,
+    property_id: int,
+):
+    property = properties_service.get_property_by_id(property_id=property_id, tema_id=tema_id)
+    if not property:
+        raise HTTPException(status_code=404, detail="Could not find lyric!")
+    return properties_fragments.property_editor(
+        request=request,
+        logged_in=logged_in,
+        property=property,
+    )
diff --git a/folkugat_web/assets/templates/fragments/pdf_viewer.html b/folkugat_web/assets/templates/fragments/pdf_viewer.html
index d1089c0..c6d29fa 100644
--- a/folkugat_web/assets/templates/fragments/pdf_viewer.html
+++ b/folkugat_web/assets/templates/fragments/pdf_viewer.html
@@ -37,4 +37,7 @@
   <div>
     <span><span id="page_num">?</span> / <span id="page_count">?</span></span>
   </div>
+  <div class="text-beige border rounded border-beige m-2 p-1">
+    <a href="{{ pdf_url }}" target="_blank">Obre el PDF</a>
+  </div>
 </div>
diff --git a/folkugat_web/assets/templates/fragments/tema/editor/link.html b/folkugat_web/assets/templates/fragments/tema/editor/link.html
index daa00ad..59aa0b3 100644
--- a/folkugat_web/assets/templates/fragments/tema/editor/link.html
+++ b/folkugat_web/assets/templates/fragments/tema/editor/link.html
@@ -36,14 +36,14 @@
   <div class="m-2 text-sm text-beige">
     <button title="Desa els canvis"
             class="mx-1"
-            hx-put="/api/tema/{{ tema.id }}/link/{{ link.id }}"
+            hx-put="/api/tema/{{ link.tema_id }}/link/{{ link.id }}"
             hx-target="#tema-link-{{ link.id }}"
             hx-swap="outerHTML">
       <i class="fa fa-check" aria-hidden="true"></i>
     </button>
     <button title="Descarta els canvis"
             class="mx-1"
-            hx-get="/api/tema/{{ tema.id }}/link/{{ link.id }}"
+            hx-get="/api/tema/{{ link.tema_id }}/link/{{ link.id }}"
             hx-target="#tema-link-{{ link.id }}"
             hx-swap="outerHTML">
       <i class="fa fa-times" aria-hidden="true"></i>
diff --git a/folkugat_web/assets/templates/fragments/tema/editor/link_file.html b/folkugat_web/assets/templates/fragments/tema/editor/link_file.html
index a956935..27a0f3b 100644
--- a/folkugat_web/assets/templates/fragments/tema/editor/link_file.html
+++ b/folkugat_web/assets/templates/fragments/tema/editor/link_file.html
@@ -1,4 +1,4 @@
-<div id="link-editor-{{ link_id }}-file"
+<div id="link-editor-{{ link.id }}-file"
      class="flex flex-row gap-2">
     <input type='file'
            class="border border-beige focus:outline-none
@@ -7,8 +7,8 @@
             name='upload_file'>
     <button title="Afegeix un enllaç"
             class="border border-beige rounded px-2 py-1 my-1"
-            hx-get="/api/tema/{{ tema.id }}/editor/link/{{ link_id }}/url"
-            hx-target="#link-editor-{{ link_id }}-file"
+            hx-get="/api/tema/{{ link.tema_id }}/editor/link/{{ link.id }}/url"
+            hx-target="#link-editor-{{ link.id }}-file"
             hx-swap="outerHTML"
             >
       <i class="fa fa-link" aria-hidden="true"></i>
diff --git a/folkugat_web/assets/templates/fragments/tema/editor/link_url.html b/folkugat_web/assets/templates/fragments/tema/editor/link_url.html
index 0f73a99..1e0c57e 100644
--- a/folkugat_web/assets/templates/fragments/tema/editor/link_url.html
+++ b/folkugat_web/assets/templates/fragments/tema/editor/link_url.html
@@ -1,4 +1,4 @@
-<div id="link-editor-{{ link_id }}-url"
+<div id="link-editor-{{ link.id }}-url"
      class="flex flex-row gap-2">
     <input name="url"
            placeholder="URL de l'enllaç"
@@ -6,7 +6,7 @@
            class="border border-beige focus:outline-none
                   rounded grow
                   bg-brown p-1 my-1"
-           hx-get="/api/tema/{{ tema.id }}/link/{{ link_id }}/icon"
+           hx-get="/api/tema/{{ link.tema_id }}/link/{{ link.id }}/icon"
            hx-trigger="keyup delay:500ms changed"
            hx-target="#link-icon-{{ link.id }}"
            hx-include="[name='content_type']"
@@ -14,8 +14,8 @@
            />
     <button title="Puja un fitxer"
             class="border border-beige rounded py-1 px-2 my-1"
-            hx-get="/api/tema/{{ tema.id }}/editor/link/{{ link_id }}/file"
-            hx-target="#link-editor-{{ link_id }}-url"
+            hx-get="/api/tema/{{ link.tema_id }}/editor/link/{{ link.id }}/file"
+            hx-target="#link-editor-{{ link.id }}-url"
             hx-swap="outerHTML"
             >
     <i class="fa fa-upload" aria-hidden="true"></i>
diff --git a/folkugat_web/assets/templates/fragments/tema/editor/lyric.html b/folkugat_web/assets/templates/fragments/tema/editor/lyric.html
index d82312f..c754056 100644
--- a/folkugat_web/assets/templates/fragments/tema/editor/lyric.html
+++ b/folkugat_web/assets/templates/fragments/tema/editor/lyric.html
@@ -9,21 +9,21 @@
       />
     <button title="Desa els canvis"
             class="mx-1"
-            hx-put="/api/tema/{{ tema.id }}/lyric/{{ lyric.id }}"
+            hx-put="/api/tema/{{ lyric.tema_id }}/lyric/{{ lyric.id }}"
             hx-target="#tema-lyric-{{ lyric.id }}"
             hx-swap="outerHTML">
       <i class="fa fa-check" aria-hidden="true"></i>
     </button>
     <button title="Descarta els canvis"
             class="mx-1"
-            hx-get="/api/tema/{{ tema.id }}/lyric/{{ lyric.id }}"
+            hx-get="/api/tema/{{ lyric.tema_id }}/lyric/{{ lyric.id }}"
             hx-target="#tema-lyric-{{ lyric.id }}"
             hx-swap="outerHTML">
       <i class="fa fa-times" aria-hidden="true"></i>
     </button>
   </h5>
   <hr class="h-px mt-1 mb-3 bg-beige border-0">
-  <textarea name="lyric"
+  <textarea name="content"
       placeholder="Lletra"
       rows="{{ lyric.content.count('\n') + 1 }}"
       class="border border-beige focus:outline-none
diff --git a/folkugat_web/assets/templates/fragments/tema/editor/property.html b/folkugat_web/assets/templates/fragments/tema/editor/property.html
index 5ddedbe..2190354 100644
--- a/folkugat_web/assets/templates/fragments/tema/editor/property.html
+++ b/folkugat_web/assets/templates/fragments/tema/editor/property.html
@@ -30,14 +30,14 @@
   </div>
   <button title="Desa els canvis"
           class="text-sm text-beige mx-1"
-          hx-put="/api/tema/{{ tema.id }}/property/{{ property.id }}"
+          hx-put="/api/tema/{{ property.tema_id }}/property/{{ property.id }}"
           hx-target="#tema-property-{{ property.id }}"
           hx-swap="outerHTML">
     <i class="fa fa-check" aria-hidden="true"></i>
   </button>
   <button title="Descarta els canvis"
           class="text-sm text-beige mx-1"
-          hx-get="/api/tema/{{ tema.id }}/property/{{ property.id }}"
+          hx-get="/api/tema/{{ property.tema_id }}/property/{{ property.id }}"
           hx-target="#tema-property-{{ property.id }}"
           hx-swap="outerHTML">
     <i class="fa fa-times" aria-hidden="true"></i>
diff --git a/folkugat_web/assets/templates/fragments/tema/link.html b/folkugat_web/assets/templates/fragments/tema/link.html
index 67786f6..3ab7f1c 100644
--- a/folkugat_web/assets/templates/fragments/tema/link.html
+++ b/folkugat_web/assets/templates/fragments/tema/link.html
@@ -14,14 +14,14 @@
   <div class="m-2 text-sm text-beige">
       <button title="Modifica l'enllaç"
               class="mx-1"
-              hx-get="/api/tema/{{ tema.id }}/editor/link/{{ link.id }}"
+              hx-get="/api/tema/{{ link.tema_id }}/editor/link/{{ link.id }}"
               hx-target="#tema-link-{{ link.id }}"
               hx-swap="outerHTML">
         <i class="fa fa-pencil" aria-hidden="true"></i>
       </button>
       <button title="Esborra l'enllaç"
               class="mx-1"
-              hx-delete="/api/tema/{{ tema.id }}/link/{{ link.id }}"
+              hx-delete="/api/tema/{{ link.tema_id }}/link/{{ link.id }}"
               hx-target="#tema-link-{{ link.id }}"
               hx-swap="outerHTML">
         <i class="fa fa-times" aria-hidden="true"></i>
diff --git a/folkugat_web/assets/templates/fragments/tema/links.html b/folkugat_web/assets/templates/fragments/tema/links.html
index dd3ad3b..88f544b 100644
--- a/folkugat_web/assets/templates/fragments/tema/links.html
+++ b/folkugat_web/assets/templates/fragments/tema/links.html
@@ -11,7 +11,7 @@
 
 {% if logged_in %}
 <div class="flex flex-row my-2 justify-end">
-  <button title="Afegeix una lletra"
+  <button title="Afegeix un enllaç"
           class="text-sm text-beige text-right"
           hx-post="/api/tema/{{ tema.id }}/link"
           hx-target="#new-link-target"
diff --git a/folkugat_web/assets/templates/fragments/tema/lyric.html b/folkugat_web/assets/templates/fragments/tema/lyric.html
index 2cb04fe..37fa4ac 100644
--- a/folkugat_web/assets/templates/fragments/tema/lyric.html
+++ b/folkugat_web/assets/templates/fragments/tema/lyric.html
@@ -4,14 +4,14 @@
     {% if logged_in %}
     <button title="Modifica la lletra"
             class="mx-1"
-            hx-get="/api/tema/{{ tema.id }}/editor/lyric/{{ lyric.id }}"
+            hx-get="/api/tema/{{ lyric.tema_id }}/editor/lyric/{{ lyric.id }}"
             hx-target="#tema-lyric-{{ lyric.id }}"
             hx-swap="outerHTML">
       <i class="fa fa-pencil" aria-hidden="true"></i>
     </button>
     <button title="Esborra la lletra"
             class="mx-1"
-            hx-delete="/api/tema/{{ tema.id }}/lyric/{{ lyric.id }}"
+            hx-delete="/api/tema/{{ lyric.tema_id }}/lyric/{{ lyric.id }}"
             hx-target="#tema-lyric-{{ lyric.id }}"
             hx-swap="outerHTML">
       <i class="fa fa-times" aria-hidden="true"></i>
diff --git a/folkugat_web/assets/templates/fragments/tema/property.html b/folkugat_web/assets/templates/fragments/tema/property.html
index 2a54e7d..023d4f7 100644
--- a/folkugat_web/assets/templates/fragments/tema/property.html
+++ b/folkugat_web/assets/templates/fragments/tema/property.html
@@ -11,14 +11,14 @@
   <div class="grow"></div>
   <button title="Modifica la informació"
           class="text-sm text-beige mx-1"
-          hx-get="/api/tema/{{ tema.id }}/editor/property/{{ property.id }}"
+          hx-get="/api/tema/{{ property.tema_id }}/editor/property/{{ property.id }}"
           hx-target="#tema-property-{{ property.id }}"
           hx-swap="outerHTML">
     <i class="fa fa-pencil" aria-hidden="true"></i>
   </button>
   <button title="Esborra la informació"
           class="text-sm text-beige mx-1"
-          hx-delete="/api/tema/{{ tema.id }}/property/{{ property.id }}"
+          hx-delete="/api/tema/{{ property.tema_id }}/property/{{ property.id }}"
           hx-target="#tema-property-{{ property.id }}"
           hx-swap="outerHTML">
     <i class="fa fa-times" aria-hidden="true"></i>
diff --git a/folkugat_web/dal/sql/_connection.py b/folkugat_web/dal/sql/_connection.py
index d546ead..726b0ca 100644
--- a/folkugat_web/dal/sql/_connection.py
+++ b/folkugat_web/dal/sql/_connection.py
@@ -1,6 +1,6 @@
 import sqlite3
+from collections.abc import Iterator
 from contextlib import contextmanager
-from typing import Iterator, Optional
 
 from folkugat_web.config.db import DB_FILE
 
@@ -13,6 +13,7 @@ def get_connection(con: Connection | None = None) -> Iterator[Connection]:
         yield con
     else:
         con = sqlite3.connect(DB_FILE)
+        _ = con.execute('PRAGMA foreign_keys = ON;')
         try:
             yield con
             con.commit()
diff --git a/folkugat_web/dal/sql/playlists/ddl.py b/folkugat_web/dal/sql/playlists/ddl.py
index e641f4c..609b67c 100644
--- a/folkugat_web/dal/sql/playlists/ddl.py
+++ b/folkugat_web/dal/sql/playlists/ddl.py
@@ -6,12 +6,6 @@ def create_db(con: Connection | None = None):
         create_playlists_table(con)
 
 
-def drop_playlists_table(con: Connection):
-    query = "DROP TABLE IF EXISTS playlists"
-    cur = con.cursor()
-    _ = cur.execute(query)
-
-
 def create_playlists_table(con: Connection):
     query = """
       CREATE TABLE IF NOT EXISTS playlists (
diff --git a/folkugat_web/dal/sql/sessions/ddl.py b/folkugat_web/dal/sql/sessions/ddl.py
index 800506f..6f5c742 100644
--- a/folkugat_web/dal/sql/sessions/ddl.py
+++ b/folkugat_web/dal/sql/sessions/ddl.py
@@ -6,12 +6,6 @@ def create_db(con: Connection | None = None):
         create_sessions_table(con)
 
 
-def drop_sessions_table(con: Connection):
-    query = "DROP TABLE IF EXISTS sessions"
-    cur = con.cursor()
-    _ = cur.execute(query)
-
-
 def create_sessions_table(con: Connection):
     query = """
       CREATE TABLE IF NOT EXISTS sessions (
diff --git a/folkugat_web/dal/sql/temes/conversion.py b/folkugat_web/dal/sql/temes/conversion.py
index 89c713c..5180add 100644
--- a/folkugat_web/dal/sql/temes/conversion.py
+++ b/folkugat_web/dal/sql/temes/conversion.py
@@ -2,21 +2,16 @@ import datetime
 import json
 from typing import TypedDict
 
-from folkugat_web.model import IndexedList
 from folkugat_web.model import search as search_model
 from folkugat_web.model import temes as model
 
-TemaRowTuple = tuple[int, str, str, str, str, str, str, str, str, int]
+TemaRowTuple = tuple[int, str, str, str, str, int]
 
 
 class TemaRowDict(TypedDict):
     id: int | None
     title: str
-    properties: str
-    links: str
-    lyrics: str
     alternatives: str
-    ngrams: str
     modification_date: str
     creation_date: str
     hidden: int
@@ -26,31 +21,24 @@ def tema_to_row(tema: model.Tema) -> TemaRowDict:
     return {
         'id': tema.id,
         'title': tema.title,
-        'properties': json.dumps(list(map(lambda p: p.to_dict(), tema.properties))),
-        'links': json.dumps(list(map(lambda l: l.to_dict(), tema.links))),
-        'lyrics': json.dumps(list(map(lambda l: l.to_dict(), tema.lyrics))),
         'alternatives': json.dumps(tema.alternatives),
-        'ngrams': json.dumps(tema.ngrams),
         'modification_date': tema.modification_date.isoformat(),
         'creation_date': tema.creation_date.isoformat(),
         'hidden': 1 if tema.hidden else 0,
     }
 
 
-def cell_to_ngrams(cell: str) -> search_model.NGrams:
-    return {int(n): ngrams_ for n, ngrams_ in json.loads(cell).items()}
+def cell_to_ngrams(cell_str: str) -> search_model.NGrams:
+    cell: dict[str, list[str]] = json.loads(cell_str)
+    return {int(n): ngrams_ for n, ngrams_ in cell.items()}
 
 
 def row_to_tema(row: TemaRowTuple) -> model.Tema:
     return model.Tema(
         id=row[0],
         title=row[1],
-        properties=IndexedList(map(model.Property.from_dict, json.loads(row[2]))),
-        links=IndexedList(map(model.Link.from_dict, json.loads(row[3]))),
-        lyrics=IndexedList(map(model.Lyrics.from_dict, json.loads(row[4]))),
-        alternatives=json.loads(row[5]),
-        ngrams=cell_to_ngrams(row[6]),
-        modification_date=datetime.datetime.fromisoformat(row[7]),
-        creation_date=datetime.datetime.fromisoformat(row[8]),
-        hidden=bool(row[9]),
+        alternatives=json.loads(row[2]),
+        modification_date=datetime.datetime.fromisoformat(row[3]),
+        creation_date=datetime.datetime.fromisoformat(row[4]),
+        hidden=bool(row[5]),
     )
diff --git a/folkugat_web/dal/sql/temes/ddl.py b/folkugat_web/dal/sql/temes/ddl.py
index 5de2754..ae9e126 100644
--- a/folkugat_web/dal/sql/temes/ddl.py
+++ b/folkugat_web/dal/sql/temes/ddl.py
@@ -4,12 +4,9 @@ from folkugat_web.dal.sql import Connection, get_connection
 def create_db(con: Connection | None = None):
     with get_connection(con) as con:
         create_temes_table(con)
-
-
-def drop_temes_table(con: Connection):
-    query = "DROP TABLE IF EXISTS temes"
-    cur = con.cursor()
-    _ = cur.execute(query)
+        create_links_table(con)
+        create_lyrics_table(con)
+        create_properties_table(con)
 
 
 def create_temes_table(con: Connection):
@@ -17,11 +14,7 @@ def create_temes_table(con: Connection):
       CREATE TABLE IF NOT EXISTS temes (
         id INTEGER PRIMARY KEY,
         title TEXT NOT NULL,
-        properties TEXT,
-        links TEXT,
-        lyrics TEXT,
         alternatives TEXT,
-        ngrams TEXT,
         creation_date TEXT NOT NULL,
         modification_date TEXT NOT NULL,
         hidden INTEGER NOT NULL
@@ -29,3 +22,47 @@ def create_temes_table(con: Connection):
     """
     cur = con.cursor()
     _ = cur.execute(query)
+
+
+def create_links_table(con: Connection):
+    query = """
+      CREATE TABLE IF NOT EXISTS tema_links (
+        id INTEGER PRIMARY KEY,
+        tema_id INTEGER,
+        content_type TEXT NOT NULL,
+        link_type TEXT,
+        title TEXT NOT NULL,
+        url TEXT NOT NULL,
+        FOREIGN KEY(tema_id) REFERENCES temes(id) ON DELETE CASCADE
+    )
+    """
+    cur = con.cursor()
+    _ = cur.execute(query)
+
+
+def create_lyrics_table(con: Connection):
+    query = """
+      CREATE TABLE IF NOT EXISTS tema_lyrics (
+        id INTEGER PRIMARY KEY,
+        tema_id INTEGER,
+        title TEXT NOT NULL,
+        content TEXT NOT NULL,
+        FOREIGN KEY(tema_id) REFERENCES temes(id) ON DELETE CASCADE
+    )
+    """
+    cur = con.cursor()
+    _ = cur.execute(query)
+
+
+def create_properties_table(con: Connection):
+    query = """
+      CREATE TABLE IF NOT EXISTS tema_properties (
+        id INTEGER PRIMARY KEY,
+        tema_id INTEGER,
+        field TEXT NOT NULL,
+        value TEXT NOT NULL,
+        FOREIGN KEY(tema_id) REFERENCES temes(id) ON DELETE CASCADE
+    )
+    """
+    cur = con.cursor()
+    _ = cur.execute(query)
diff --git a/folkugat_web/dal/sql/temes/links.py b/folkugat_web/dal/sql/temes/links.py
new file mode 100644
index 0000000..62041ed
--- /dev/null
+++ b/folkugat_web/dal/sql/temes/links.py
@@ -0,0 +1,137 @@
+from collections.abc import Iterable
+from typing import TypedDict
+
+from folkugat_web.dal.sql import Connection, get_connection
+from folkugat_web.model import temes as model
+from folkugat_web.utils import map_none
+
+LinkRowTuple = tuple[int, int, str, str | None, str, str]
+
+
+class LinkRowDict(TypedDict):
+    id: int | None
+    tema_id: int
+    content_type: str
+    link_type: str | None
+    title: str
+    url: str
+
+
+def link_to_row(link: model.Link) -> LinkRowDict:
+    return {
+        "id": link.id,
+        "tema_id": link.tema_id,
+        "content_type": link.content_type.value,
+        "link_type": map_none(lambda lt: lt.value, link.link_type),
+        "title": link.title,
+        "url": link.url,
+    }
+
+
+def row_to_link(row: LinkRowTuple) -> model.Link:
+    return model.Link(
+        id=row[0],
+        tema_id=row[1],
+        content_type=model.ContentType(row[2]),
+        link_type=map_none(model.LinkType, row[3]),
+        title=row[4],
+        url=row[5],
+    )
+
+
+class QueryData(TypedDict, total=False):
+    id: int
+    tema_id: int
+
+
+def _filter_clause(
+    link_id: int | None,
+    tema_id: int | None,
+) -> tuple[str, QueryData]:
+    filter_clauses: list[str] = []
+    filter_data: QueryData = {}
+
+    if link_id is not None:
+        filter_clauses.append("id = :id")
+        filter_data["id"] = link_id
+
+    if tema_id is not None:
+        filter_clauses.append("tema_id = :tema_id")
+        filter_data["tema_id"] = tema_id
+
+    filter_clause = " AND ".join(filter_clauses)
+    return filter_clause, filter_data
+
+
+def get_links(link_id: int | None = None, tema_id: int | None = None, con: Connection | None = None) -> Iterable[model.Link]:
+    filter_clause, data = _filter_clause(link_id=link_id, tema_id=tema_id)
+    if filter_clause:
+        filter_clause = f"WHERE {filter_clause}"
+
+    query = f"""
+      SELECT
+        id, tema_id, content_type, link_type, title, url
+      FROM tema_links
+      {filter_clause}
+    """
+    with get_connection(con) as con:
+        cur = con.cursor()
+        _ = cur.execute(query, data)
+        return map(row_to_link, cur.fetchall())
+
+
+def insert_link(link: model.Link, con: Connection | None = None) -> model.Link:
+    data = link_to_row(link)
+    query = f"""
+      INSERT INTO tema_links
+        (id, tema_id, content_type, link_type, title, url)
+      VALUES
+        (:id, :tema_id, :content_type, :link_type, :title, :url)
+      RETURNING *
+    """
+    with get_connection(con) as con:
+        cur = con.cursor()
+        _ = cur.execute(query, data)
+        row: LinkRowTuple = cur.fetchone()
+        return row_to_link(row)
+
+
+def create_link(tema_id: int, con: Connection | None = None) -> model.Link:
+    new_link = model.Link(
+        id=None,
+        tema_id=tema_id,
+        content_type=model.ContentType.PARTITURA,
+        link_type=None,
+        url="",
+        title="",
+    )
+    return insert_link(new_link, con=con)
+
+
+def update_link(link: model.Link, con: Connection | None = None):
+    data = link_to_row(link)
+    query = """
+      UPDATE tema_links
+      SET
+        tema_id = :tema_id, content_type = :content_type, link_type = :link_type,
+        title = :title, url = :url
+      WHERE
+        id = :id
+    """
+    with get_connection(con) as con:
+        cur = con.cursor()
+        _ = cur.execute(query, data)
+
+
+def delete_link(link_id: int, tema_id: int | None = None, con: Connection | None = None):
+    filter_clause, data = _filter_clause(link_id=link_id, tema_id=tema_id)
+    if filter_clause:
+        filter_clause = f"WHERE {filter_clause}"
+
+    query = f"""
+      DELETE FROM tema_links
+      {filter_clause}
+    """
+    with get_connection(con) as con:
+        cur = con.cursor()
+        _ = cur.execute(query, data)
diff --git a/folkugat_web/dal/sql/temes/lyrics.py b/folkugat_web/dal/sql/temes/lyrics.py
new file mode 100644
index 0000000..1b1364d
--- /dev/null
+++ b/folkugat_web/dal/sql/temes/lyrics.py
@@ -0,0 +1,127 @@
+from collections.abc import Iterable
+from typing import TypedDict
+
+from folkugat_web.dal.sql import Connection, get_connection
+from folkugat_web.model import temes as model
+
+LyricRowTuple = tuple[int, int, str, str]
+
+
+class LyricRowDict(TypedDict):
+    id: int | None
+    tema_id: int
+    title: str
+    content: str
+
+
+def lyric_to_row(lyric: model.Lyrics) -> LyricRowDict:
+    return {
+        "id": lyric.id,
+        "tema_id": lyric.tema_id,
+        "title": lyric.title,
+        "content": lyric.content,
+    }
+
+
+def row_to_lyric(row: LyricRowTuple) -> model.Lyrics:
+    return model.Lyrics(
+        id=row[0],
+        tema_id=row[1],
+        title=row[2],
+        content=row[3],
+    )
+
+
+class QueryData(TypedDict, total=False):
+    id: int
+    tema_id: int
+
+
+def _filter_clause(
+    lyric_id: int | None,
+    tema_id: int | None,
+) -> tuple[str, QueryData]:
+    filter_clauses: list[str] = []
+    filter_data: QueryData = {}
+
+    if lyric_id is not None:
+        filter_clauses.append("id = :id")
+        filter_data["id"] = lyric_id
+
+    if tema_id is not None:
+        filter_clauses.append("tema_id = :tema_id")
+        filter_data["tema_id"] = tema_id
+
+    filter_clause = " AND ".join(filter_clauses)
+    return filter_clause, filter_data
+
+
+def get_lyrics(lyric_id: int | None = None, tema_id: int | None = None, con: Connection | None = None) -> Iterable[model.Lyrics]:
+    filter_clause, data = _filter_clause(lyric_id=lyric_id, tema_id=tema_id)
+    if filter_clause:
+        filter_clause = f"WHERE {filter_clause}"
+
+    query = f"""
+      SELECT
+        id, tema_id, title, content
+      FROM tema_lyrics
+      {filter_clause}
+    """
+    with get_connection(con) as con:
+        cur = con.cursor()
+        _ = cur.execute(query, data)
+        return map(row_to_lyric, cur.fetchall())
+
+
+def insert_lyric(lyric: model.Lyrics, con: Connection | None = None) -> model.Lyrics:
+    data = lyric_to_row(lyric)
+    query = f"""
+      INSERT INTO tema_lyrics
+        (id, tema_id, title, content)
+      VALUES
+        (:id, :tema_id, :title, :content)
+      RETURNING *
+    """
+    with get_connection(con) as con:
+        cur = con.cursor()
+        _ = cur.execute(query, data)
+        row: LyricRowTuple = cur.fetchone()
+        return row_to_lyric(row)
+
+
+def create_lyric(tema_id: int, title: str | None = None, con: Connection | None = None) -> model.Lyrics:
+    new_lyric = model.Lyrics(
+        id=None,
+        tema_id=tema_id,
+        title=title or "",
+        content="",
+    )
+    return insert_lyric(new_lyric, con=con)
+
+
+def update_lyric(lyric: model.Lyrics, con: Connection | None = None):
+    data = lyric_to_row(lyric)
+    query = """
+      UPDATE tema_lyrics
+      SET
+        tema_id = :tema_id, title = :title, content = :content
+      WHERE
+        id = :id
+    """
+    with get_connection(con) as con:
+        cur = con.cursor()
+        _ = cur.execute(query, data)
+
+
+def delete_lyric(lyric_id: int, tema_id: int | None = None, con: Connection | None = None):
+    filter_clause, data = _filter_clause(lyric_id=lyric_id, tema_id=tema_id)
+    if filter_clause:
+        filter_clause = f"WHERE {filter_clause}"
+
+    query = f"""
+      DELETE FROM tema_lyrics
+      {filter_clause}
+    """
+    with get_connection(con) as con:
+        cur = con.cursor()
+        _ = cur.execute(query, data)
diff --git a/folkugat_web/dal/sql/temes/properties.py b/folkugat_web/dal/sql/temes/properties.py
new file mode 100644
index 0000000..95db70b
--- /dev/null
+++ b/folkugat_web/dal/sql/temes/properties.py
@@ -0,0 +1,127 @@
+from collections.abc import Iterable
+from typing import TypedDict
+
+from folkugat_web.dal.sql import Connection, get_connection
+from folkugat_web.model import temes as model
+
+PropertyRowTuple = tuple[int, int, str, str]
+
+
+class PropertyRowDict(TypedDict):
+    id: int | None
+    tema_id: int
+    field: str
+    value: str
+
+
+def property_to_row(property: model.Property) -> PropertyRowDict:
+    return {
+        "id": property.id,
+        "tema_id": property.tema_id,
+        "field": property.field.value,
+        "value": property.value,
+    }
+
+
+def row_to_property(row: PropertyRowTuple) -> model.Property:
+    return model.Property(
+        id=row[0],
+        tema_id=row[1],
+        field=model.PropertyField(row[2]),
+        value=row[3],
+    )
+
+
+class QueryData(TypedDict, total=False):
+    id: int
+    tema_id: int
+
+
+def _filter_clause(
+    property_id: int | None,
+    tema_id: int | None,
+) -> tuple[str, QueryData]:
+    filter_clauses: list[str] = []
+    filter_data: QueryData = {}
+
+    if property_id is not None:
+        filter_clauses.append("id = :id")
+        filter_data["id"] = property_id
+
+    if tema_id is not None:
+        filter_clauses.append("tema_id = :tema_id")
+        filter_data["tema_id"] = tema_id
+
+    filter_clause = " AND ".join(filter_clauses)
+    return filter_clause, filter_data
+
+
+def get_properties(property_id: int | None = None, tema_id: int | None = None, con: Connection | None = None) -> Iterable[model.Property]:
+    filter_clause, data = _filter_clause(property_id=property_id, tema_id=tema_id)
+    if filter_clause:
+        filter_clause = f"WHERE {filter_clause}"
+
+    query = f"""
+      SELECT
+        id, tema_id, field, value
+      FROM tema_properties
+      {filter_clause}
+    """
+    with get_connection(con) as con:
+        cur = con.cursor()
+        _ = cur.execute(query, data)
+        return map(row_to_property, cur.fetchall())
+
+
+def insert_property(property: model.Property, con: Connection | None = None) -> model.Property:
+    data = property_to_row(property)
+    query = f"""
+      INSERT INTO tema_properties
+        (id, tema_id, field, value)
+      VALUES
+        (:id, :tema_id, :field, :value)
+      RETURNING *
+    """
+    with get_connection(con) as con:
+        cur = con.cursor()
+        _ = cur.execute(query, data)
+        row: PropertyRowTuple = cur.fetchone()
+        return row_to_property(row)
+
+
+def create_property(tema_id: int, field: model.PropertyField | None = None, con: Connection | None = None) -> model.Property:
+    new_property = model.Property(
+        id=None,
+        tema_id=tema_id,
+        field=field or model.PropertyField.AUTOR,
+        value="",
+    )
+    return insert_property(new_property, con=con)
+
+
+def update_property(property: model.Property, con: Connection | None = None):
+    data = property_to_row(property)
+    query = """
+      UPDATE tema_properties
+      SET
+        tema_id = :tema_id, field = :field, value = :value
+      WHERE
+        id = :id
+    """
+    with get_connection(con) as con:
+        cur = con.cursor()
+        _ = cur.execute(query, data)
+
+
+def delete_property(property_id: int, tema_id: int | None = None, con: Connection | None = None):
+    filter_clause, data = _filter_clause(property_id=property_id, tema_id=tema_id)
+    if filter_clause:
+        filter_clause = f"WHERE {filter_clause}"
+
+    query = f"""
+      DELETE FROM tema_properties
+      {filter_clause}
+    """
+    with get_connection(con) as con:
+        cur = con.cursor()
+        _ = cur.execute(query, data)
diff --git a/folkugat_web/dal/sql/temes/query.py b/folkugat_web/dal/sql/temes/query.py
index 1af93f5..b2af9eb 100644
--- a/folkugat_web/dal/sql/temes/query.py
+++ b/folkugat_web/dal/sql/temes/query.py
@@ -10,8 +10,7 @@ _tema_id_to_ngrams_cache: dict[int, search_model.NGrams] | None = None
 def get_tema_by_id(tema_id: int, con: Connection | None = None) -> model.Tema | None:
     query = """
       SELECT
-        id, title, properties, links, lyrics, alternatives, ngrams,
-        creation_date, modification_date, hidden
+        id, title, alternatives, creation_date, modification_date, hidden
       FROM temes
       WHERE id = :id
     """
diff --git a/folkugat_web/dal/sql/temes/write.py b/folkugat_web/dal/sql/temes/write.py
index b7f33cd..1c4a494 100644
--- a/folkugat_web/dal/sql/temes/write.py
+++ b/folkugat_web/dal/sql/temes/write.py
@@ -1,4 +1,7 @@
+import json
+
 from folkugat_web.dal.sql import Connection, get_connection
+from folkugat_web.model import search as search_model
 from folkugat_web.model import temes as model
 
 from . import conversion
@@ -8,12 +11,10 @@ from .query import evict_tema_id_to_ngrams_cache
 def insert_tema(tema: model.Tema, con: Connection | None = None) -> model.Tema:
     query = """
       INSERT INTO temes
-        (id, title, properties, links, lyrics, alternatives, ngrams,
-         creation_date, modification_date, hidden)
+        (id, title, alternatives, creation_date, modification_date, hidden)
       VALUES
-        (:id, :title, :properties, :links, :lyrics, :alternatives, :ngrams,
-         :creation_date, :modification_date, :hidden)
-      RETURNING *
+        (:id, :title, :alternatives, :creation_date, :modification_date, :hidden)
+      RETURNING id, title, alternatives, creation_date, modification_date, hidden
     """
     data = conversion.tema_to_row(tema)
     with get_connection(con) as con:
@@ -28,13 +29,27 @@ def update_tema(tema: model.Tema, con: Connection | None = None):
     query = """
       UPDATE temes
       SET
-        title = :title, properties = :properties, links = :links, lyrics = :lyrics,
-        alternatives = :alternatives, ngrams = :ngrams, creation_date = :creation_date,
+        title = :title, alternatives = :alternatives, creation_date = :creation_date,
         modification_date = :modification_date, hidden = :hidden
       WHERE
         id = :id
     """
     data = conversion.tema_to_row(tema)
+    with get_connection(con) as con:
+        cur = con.cursor()
+        _ = cur.execute(query, data)
+        return
+
+
+def update_ngrams(tema: model.Tema, con: Connection | None = None):
+    query = """
+      UPDATE temes
+      SET
+        ngrams = :ngrams
+      WHERE
+        id = :id
+    """
+    data = dict(id=tema.id, ngrams=json.dumps(tema.ngrams()))
     with get_connection(con) as con:
         cur = con.cursor()
         _ = cur.execute(query, data)
diff --git a/folkugat_web/fragments/tema.py b/folkugat_web/fragments/tema.py
deleted file mode 100644
index 7ec8235..0000000
--- a/folkugat_web/fragments/tema.py
+++ /dev/null
@@ -1,239 +0,0 @@
-from fastapi import HTTPException, Request
-from folkugat_web.model import temes as model
-from folkugat_web.services.temes import query as temes_q
-from folkugat_web.services.temes.links import guess_link_type
-from folkugat_web.templates import templates
-
-
-def title(request: Request, logged_in: bool, tema: model.Tema | None = None, tema_id: int | None = None):
-    if tema is None:
-        if tema_id is None:
-            raise ValueError("Either 'tema' or 'tema_id' must be given!")
-        tema = temes_q.get_tema_by_id(tema_id)
-        if not tema:
-            raise HTTPException(status_code=404, detail="Could not find tune")
-    return templates.TemplateResponse(
-        "fragments/tema/title.html",
-        {
-            "request": request,
-            "logged_in": logged_in,
-            "tema": tema,
-        }
-    )
-
-
-def title_editor(request: Request, logged_in: bool, tema_id: int):
-    tema = temes_q.get_tema_by_id(tema_id)
-    if not tema:
-        raise HTTPException(status_code=404, detail="Could not find tune")
-    return templates.TemplateResponse(
-        "fragments/tema/editor/title.html",
-        {
-            "request": request,
-            "logged_in": logged_in,
-            "tema": tema,
-        }
-    )
-
-
-def lyric(request: Request, logged_in: bool, tema_id: int, lyric_id: int):
-    tema = temes_q.get_tema_by_id(tema_id)
-    if not tema:
-        raise HTTPException(status_code=404, detail="Could not find tune")
-    lyric = tema.lyrics.get(lyric_id)
-
-    return templates.TemplateResponse(
-        "fragments/tema/lyric.html",
-        {
-            "request": request,
-            "logged_in": logged_in,
-            "tema": tema,
-            "lyric_id": lyric_id,
-            "lyric": lyric,
-        }
-    )
-
-
-def lyric_editor(request: Request, logged_in: bool, tema_id: int, lyric_id: int):
-    tema = temes_q.get_tema_by_id(tema_id)
-    if not tema:
-        raise HTTPException(status_code=404, detail="Could not find tune")
-    lyric = tema.lyrics.get(lyric_id)
-
-    return templates.TemplateResponse(
-        "fragments/tema/editor/lyric.html",
-        {
-            "request": request,
-            "logged_in": logged_in,
-            "tema": tema,
-            "lyric_id": lyric_id,
-            "lyric": lyric,
-        }
-    )
-
-
-def link(request: Request, logged_in: bool, tema_id: int, link_id: int):
-    tema = temes_q.get_tema_by_id(tema_id)
-    if not tema:
-        raise HTTPException(status_code=404, detail="Could not find tune")
-    link = tema.links.get(link_id)
-
-    return templates.TemplateResponse(
-        "fragments/tema/link.html",
-        {
-            "request": request,
-            "logged_in": logged_in,
-            "tema": tema,
-            "link_id": link_id,
-            "link": link,
-            "LinkType": model.LinkType,
-            "ContentType": model.ContentType,
-        },
-        headers={
-            "HX-Trigger": f"reload-tema-{tema_id}-score"
-        }
-    )
-
-
-def link_editor(request: Request, logged_in: bool, tema_id: int, link_id: int):
-    tema = temes_q.get_tema_by_id(tema_id)
-    if not tema:
-        raise HTTPException(status_code=404, detail="Could not find tune")
-    link = tema.links.get(link_id)
-
-    return templates.TemplateResponse(
-        "fragments/tema/editor/link.html",
-        {
-            "request": request,
-            "logged_in": logged_in,
-            "tema": tema,
-            "link_id": link_id,
-            "link": link,
-            "LinkType": model.LinkType,
-            "ContentType": model.ContentType,
-        }
-    )
-
-
-def link_editor_url(request: Request, logged_in: bool, tema_id: int, link_id: int):
-    tema = temes_q.get_tema_by_id(tema_id)
-    if not tema:
-        raise HTTPException(status_code=404, detail="Could not find tune")
-    link = tema.links.get(link_id)
-    return templates.TemplateResponse(
-        "fragments/tema/editor/link_url.html",
-        {
-            "request": request,
-            "logged_in": logged_in,
-            "tema": tema,
-            "link_id": link_id,
-            "link": link,
-            "LinkType": model.LinkType,
-            "ContentType": model.ContentType,
-        }
-    )
-
-
-def link_editor_file(request: Request, logged_in: bool, tema_id: int, link_id: int):
-    tema = temes_q.get_tema_by_id(tema_id)
-    if not tema:
-        raise HTTPException(status_code=404, detail="Could not find tune")
-    link = tema.links.get(link_id)
-    return templates.TemplateResponse(
-        "fragments/tema/editor/link_file.html",
-        {
-            "request": request,
-            "logged_in": logged_in,
-            "tema": tema,
-            "link_id": link_id,
-            "link": link,
-            "LinkType": model.LinkType,
-            "ContentType": model.ContentType,
-        }
-    )
-
-
-def link_icon(request: Request, logged_in: bool, tema_id: int, link_id: int, url: str,
-              content_type: model.ContentType):
-    link = model.Link(
-        id=link_id,
-        content_type=content_type,
-        link_type=guess_link_type(url),
-        url=url,
-    )
-    return templates.TemplateResponse(
-        "fragments/tema/link_icon.html",
-        {
-            "request": request,
-            "logged_in": logged_in,
-            "tema_id": tema_id,
-            "link_id": link_id,
-            "link": link,
-            "LinkType": model.LinkType,
-            "ContentType": model.ContentType,
-        }
-    )
-
-
-def score(request: Request, logged_in: bool, tema_id: int):
-    tema = temes_q.get_tema_by_id(tema_id)
-    if not tema:
-        raise HTTPException(status_code=404, detail="Could not find tune")
-    return templates.TemplateResponse(
-        "fragments/tema/score.html",
-        {
-            "request": request,
-            "logged_in": logged_in,
-            "tema": tema,
-            "LinkType": model.LinkType,
-        }
-    )
-
-
-def property_(request: Request, logged_in: bool, tema_id: int, property_id: int):
-    tema = temes_q.get_tema_by_id(tema_id)
-    if not tema:
-        raise HTTPException(status_code=404, detail="Could not find tune")
-    prop = tema.properties.get(property_id)
-
-    return templates.TemplateResponse(
-        "fragments/tema/property.html",
-        {
-            "request": request,
-            "logged_in": logged_in,
-            "tema": tema,
-            "property_id": property_id,
-            "property": prop,
-            "PropertyField": model.PropertyField,
-        }
-    )
-
-
-def property_editor(request: Request, logged_in: bool, tema_id: int, property_id: int):
-    tema = temes_q.get_tema_by_id(tema_id)
-    if not tema:
-        raise HTTPException(status_code=404, detail="Could not find tune")
-    prop = tema.properties.get(property_id)
-
-    return templates.TemplateResponse(
-        "fragments/tema/editor/property.html",
-        {
-            "request": request,
-            "logged_in": logged_in,
-            "tema": tema,
-            "property_id": property_id,
-            "property": prop,
-            "PropertyField": model.PropertyField,
-        }
-    )
-
-
-def visibility(request: Request, logged_in: bool, tema: model.Tema):
-    return templates.TemplateResponse(
-        "fragments/tema/visibility.html",
-        {
-            "request": request,
-            "logged_in": logged_in,
-            "tema": tema,
-        }
-    )
diff --git a/folkugat_web/fragments/tema/__init__.py b/folkugat_web/fragments/tema/__init__.py
new file mode 100644
index 0000000..f249fbc
--- /dev/null
+++ b/folkugat_web/fragments/tema/__init__.py
@@ -0,0 +1,84 @@
+from fastapi import HTTPException, Request
+from folkugat_web.model import temes as model
+from folkugat_web.services.temes import query as temes_q
+from folkugat_web.templates import templates
+
+
+def title(request: Request, logged_in: bool, tema: model.Tema | None = None, tema_id: int | None = None):
+    if tema is None:
+        if tema_id is None:
+            raise ValueError("Either 'tema' or 'tema_id' must be given!")
+        tema = temes_q.get_tema_by_id(tema_id)
+        if not tema:
+            raise HTTPException(status_code=404, detail="Could not find tune")
+    return templates.TemplateResponse(
+        "fragments/tema/title.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "tema": tema,
+        }
+    )
+
+
+def title_editor(request: Request, logged_in: bool, tema_id: int):
+    tema = temes_q.get_tema_by_id(tema_id)
+    if not tema:
+        raise HTTPException(status_code=404, detail="Could not find tune")
+    return templates.TemplateResponse(
+        "fragments/tema/editor/title.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "tema": tema,
+        }
+    )
+
+
+def property_(request: Request, logged_in: bool, tema_id: int, property_id: int):
+    tema = temes_q.get_tema_by_id(tema_id)
+    if not tema:
+        raise HTTPException(status_code=404, detail="Could not find tune")
+    prop = tema.properties.get(property_id)
+
+    return templates.TemplateResponse(
+        "fragments/tema/property.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "tema": tema,
+            "property_id": property_id,
+            "property": prop,
+            "PropertyField": model.PropertyField,
+        }
+    )
+
+
+def property_editor(request: Request, logged_in: bool, tema_id: int, property_id: int):
+    tema = temes_q.get_tema_by_id(tema_id)
+    if not tema:
+        raise HTTPException(status_code=404, detail="Could not find tune")
+    prop = tema.properties.get(property_id)
+
+    return templates.TemplateResponse(
+        "fragments/tema/editor/property.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "tema": tema,
+            "property_id": property_id,
+            "property": prop,
+            "PropertyField": model.PropertyField,
+        }
+    )
+
+
+def visibility(request: Request, logged_in: bool, tema: model.Tema):
+    return templates.TemplateResponse(
+        "fragments/tema/visibility.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "tema": tema,
+        }
+    )
diff --git a/folkugat_web/fragments/tema/links.py b/folkugat_web/fragments/tema/links.py
new file mode 100644
index 0000000..c40a205
--- /dev/null
+++ b/folkugat_web/fragments/tema/links.py
@@ -0,0 +1,88 @@
+from fastapi import HTTPException, Request
+from folkugat_web.model import temes as model
+from folkugat_web.services.temes import query as temes_q
+from folkugat_web.services.temes.links import guess_link_type
+from folkugat_web.templates import templates
+
+
+def link(request: Request, logged_in: bool, link: model.Link):
+    return templates.TemplateResponse(
+        "fragments/tema/link.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "link": link,
+            "LinkType": model.LinkType,
+            "ContentType": model.ContentType,
+        },
+        headers={
+            "HX-Trigger": f"reload-tema-{link.tema_id}-score"
+        }
+    )
+
+
+def link_editor(request: Request, logged_in: bool, link: model.Link):
+    return templates.TemplateResponse(
+        "fragments/tema/editor/link.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "link": link,
+            "LinkType": model.LinkType,
+            "ContentType": model.ContentType,
+        }
+    )
+
+
+def link_editor_url(request: Request, logged_in: bool, link: model.Link):
+    return templates.TemplateResponse(
+        "fragments/tema/editor/link_url.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "link": link,
+            "LinkType": model.LinkType,
+            "ContentType": model.ContentType,
+        }
+    )
+
+
+def link_editor_file(request: Request, logged_in: bool, link: model.Link):
+    return templates.TemplateResponse(
+        "fragments/tema/editor/link_file.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "link": link,
+            "LinkType": model.LinkType,
+            "ContentType": model.ContentType,
+        }
+    )
+
+
+def link_icon(request: Request, logged_in: bool, link: model.Link):
+    return templates.TemplateResponse(
+        "fragments/tema/link_icon.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "link": link,
+            "LinkType": model.LinkType,
+            "ContentType": model.ContentType,
+        }
+    )
+
+
+def score(request: Request, logged_in: bool, tema_id: int):
+    tema = temes_q.get_tema_by_id(tema_id)
+    if not tema:
+        raise HTTPException(status_code=404, detail="Could not find tune")
+    return templates.TemplateResponse(
+        "fragments/tema/score.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "tema": tema,
+            "LinkType": model.LinkType,
+        }
+    )
diff --git a/folkugat_web/fragments/tema/lyrics.py b/folkugat_web/fragments/tema/lyrics.py
new file mode 100644
index 0000000..abf1127
--- /dev/null
+++ b/folkugat_web/fragments/tema/lyrics.py
@@ -0,0 +1,25 @@
+from fastapi import Request
+from folkugat_web.model import temes as model
+from folkugat_web.templates import templates
+
+
+def lyric(request: Request, logged_in: bool, lyric: model.Lyrics):
+    return templates.TemplateResponse(
+        "fragments/tema/lyric.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "lyric": lyric,
+        }
+    )
+
+
+def lyric_editor(request: Request, logged_in: bool, lyric: model.Lyrics):
+    return templates.TemplateResponse(
+        "fragments/tema/editor/lyric.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "lyric": lyric,
+        }
+    )
diff --git a/folkugat_web/fragments/tema/properties.py b/folkugat_web/fragments/tema/properties.py
new file mode 100644
index 0000000..04e278c
--- /dev/null
+++ b/folkugat_web/fragments/tema/properties.py
@@ -0,0 +1,27 @@
+from fastapi import Request
+from folkugat_web.model import temes as model
+from folkugat_web.templates import templates
+
+
+def property_(request: Request, logged_in: bool, property: model.Property):
+    return templates.TemplateResponse(
+        "fragments/tema/property.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "property": property,
+            "PropertyField": model.PropertyField,
+        }
+    )
+
+
+def property_editor(request: Request, logged_in: bool, property: model.Property):
+    return templates.TemplateResponse(
+        "fragments/tema/editor/property.html",
+        {
+            "request": request,
+            "logged_in": logged_in,
+            "property": property,
+            "PropertyField": model.PropertyField,
+        }
+    )
diff --git a/folkugat_web/fragments/temes.py b/folkugat_web/fragments/temes.py
index 5f790a4..3030623 100644
--- a/folkugat_web/fragments/temes.py
+++ b/folkugat_web/fragments/temes.py
@@ -1,10 +1,12 @@
-from fastapi import HTTPException, Request
+from fastapi import Request
 from folkugat_web.model import temes as model
 from folkugat_web.model.pagines import Pages
 from folkugat_web.services import sessions as sessions_service
+from folkugat_web.services.temes import links as links_service
 from folkugat_web.services.temes import query as temes_q
 from folkugat_web.services.temes import search as temes_s
 from folkugat_web.templates import templates
+from folkugat_web.utils import FnChain
 
 
 def temes_pagina(request: Request, logged_in: bool, query: str):
@@ -35,7 +37,12 @@ def temes_busca(request: Request, logged_in: bool, query: str, offset: int = 0,
     if offset > 0:
         prev_offset = max(offset - limit, 0)
 
-    temes = temes_q.temes_compute_stats(temes)
+    temes = (
+        FnChain.transform(temes) |
+        temes_q.temes_compute_stats |
+        links_service.add_links_to_temes |
+        list
+    ).result()
 
     return templates.TemplateResponse(
         "fragments/temes/results.html",
@@ -52,11 +59,7 @@ def temes_busca(request: Request, logged_in: bool, query: str, offset: int = 0,
     )
 
 
-def tema(request: Request, tema_id: int, logged_in: bool):
-    tema = temes_q.get_tema_by_id(tema_id)
-    if not tema:
-        raise HTTPException(status_code=404, detail="Could not find tune")
-    tema = temes_q.tema_compute_stats(tema)
+def tema(request: Request, logged_in: bool, tema: model.Tema):
     return templates.TemplateResponse(
         "fragments/tema/pagina.html",
         {
diff --git a/folkugat_web/model/__init__.py b/folkugat_web/model/__init__.py
index adac041..e69de29 100644
--- a/folkugat_web/model/__init__.py
+++ b/folkugat_web/model/__init__.py
@@ -1,3 +0,0 @@
-from ._base import IndexedList
-
-__all__ = ["IndexedList"]
diff --git a/folkugat_web/model/_base.py b/folkugat_web/model/_base.py
deleted file mode 100644
index 69b3a3d..0000000
--- a/folkugat_web/model/_base.py
+++ /dev/null
@@ -1,39 +0,0 @@
-import dataclasses
-from typing import TypeVar
-
-from typing_extensions import override
-
-
-@dataclasses.dataclass
-class WithId:
-    id: int | None
-
-
-T = TypeVar("T", bound=WithId)
-
-
-class IndexedList(list[T]):
-    @override
-    def append(self, _item: T) -> None:
-        if _item.id is None:
-            _item.id = max((i.id or 0 for i in self), default=0) + 1
-        return super().append(_item)
-
-    def find_idx(self, _id: int) -> int:
-        try:
-            i, _ = next(filter(lambda it: it[1].id == _id, enumerate(self)))
-        except StopIteration:
-            raise ValueError(f"Could not find item with id {_id}")
-        return i
-
-    def get(self, _id: int) -> T:
-        i = self.find_idx(_id)
-        return self.__getitem__(i)
-
-    def delete(self, _id: int) -> None:
-        i = self.find_idx(_id)
-        return super().__delitem__(i)
-
-    def replace(self, _id: int, _obj: T) -> None:
-        i = self.find_idx(_id)
-        super().__setitem__(i, _obj)
diff --git a/folkugat_web/model/temes.py b/folkugat_web/model/temes.py
index 417bdd9..e85b271 100644
--- a/folkugat_web/model/temes.py
+++ b/folkugat_web/model/temes.py
@@ -1,14 +1,11 @@
 import dataclasses
 import datetime
 import enum
-from typing import Self
 
 from folkugat_web.model.search import NGrams
 from folkugat_web.model.sessions import Session
 from folkugat_web.services import ngrams
 
-from ._base import IndexedList, WithId
-
 
 class ContentType(enum.Enum):
     PARTITURA = "partitura"
@@ -26,31 +23,14 @@ class LinkType(enum.Enum):
 
 
 @dataclasses.dataclass
-class Link(WithId):
+class Link:
+    id: int | None
+    tema_id: int
     content_type: ContentType
     link_type: LinkType | None
     url: str
     title: str = ""
 
-    def to_dict(self):
-        return dict(
-            id=self.id,
-            content_type=self.content_type.value,
-            link_type=self.link_type.value if self.link_type else None,
-            url=self.url,
-            title=self.title,
-        )
-
-    @classmethod
-    def from_dict(cls, d):
-        return cls(
-            id=d["id"],
-            content_type=ContentType(d["content_type"]),
-            link_type=LinkType(d["link_type"]) if d["link_type"] else None,
-            url=d["url"],
-            title=d["title"],
-        )
-
 
 class PropertyField(enum.Enum):
     AUTOR = "autor"
@@ -60,46 +40,20 @@ class PropertyField(enum.Enum):
 
 
 @dataclasses.dataclass
-class Property(WithId):
+class Property:
+    id: int | None
+    tema_id: int
     field: PropertyField
     value: str
 
-    def to_dict(self):
-        return dict(
-            id=self.id,
-            field=self.field.value,
-            value=self.value,
-        )
-
-    @classmethod
-    def from_dict(cls, d):
-        return cls(
-            id=d["id"],
-            field=PropertyField(d["field"]),
-            value=d["value"],
-        )
-
 
 @dataclasses.dataclass
-class Lyrics(WithId):
+class Lyrics:
+    id: int | None
+    tema_id: int
     title: str
     content: str
 
-    def to_dict(self):
-        return dict(
-            id=self.id,
-            title=self.title,
-            content=self.content,
-        )
-
-    @classmethod
-    def from_dict(cls, d) -> Self:
-        return cls(
-            id=d["id"],
-            title=d["title"],
-            content=d["content"],
-        )
-
 
 @dataclasses.dataclass
 class Stats:
@@ -112,12 +66,11 @@ class Tema:
     id: int | None = None
     # Info
     title: str = ""
-    properties: IndexedList[Property] = dataclasses.field(default_factory=IndexedList)
-    links: IndexedList[Link] = dataclasses.field(default_factory=IndexedList)
-    lyrics: IndexedList[Lyrics] = dataclasses.field(default_factory=IndexedList)
+    properties: list[Property] = dataclasses.field(default_factory=list)
+    links: list[Link] = dataclasses.field(default_factory=list)
+    lyrics: list[Lyrics] = dataclasses.field(default_factory=list)
     # Search related
     alternatives: list[str] = dataclasses.field(default_factory=list)
-    ngrams: NGrams = dataclasses.field(default_factory=dict)
     hidden: bool = True
     # Other info
     modification_date: datetime.datetime = dataclasses.field(default_factory=datetime.datetime.now)
@@ -125,12 +78,8 @@ class Tema:
     # Stats
     stats: Stats | None = None
 
-    def compute_ngrams(self):
-        self.ngrams = ngrams.get_text_ngrams(self.title, *self.alternatives)
-
-    def with_ngrams(self):
-        self.compute_ngrams()
-        return self
+    def ngrams(self) -> NGrams:
+        return ngrams.get_text_ngrams(self.title, *self.alternatives)
 
     @staticmethod
     def _is_score(link: Link) -> bool:
diff --git a/folkugat_web/services/files.py b/folkugat_web/services/files.py
index b0f1d81..518956e 100644
--- a/folkugat_web/services/files.py
+++ b/folkugat_web/services/files.py
@@ -48,7 +48,7 @@ async def store_file(tema_id: int, upload_file: UploadFile) -> str:
     filepath = filedir / filename
 
     with open(filepath, "wb") as f:
-        f.write(await upload_file.read())
+        _ = f.write(await upload_file.read())
 
     return get_db_file_path(filepath)
 
diff --git a/folkugat_web/services/temes/links.py b/folkugat_web/services/temes/links.py
index f7a2b75..e3a9f54 100644
--- a/folkugat_web/services/temes/links.py
+++ b/folkugat_web/services/temes/links.py
@@ -1,6 +1,7 @@
 import re
-from typing import Optional
+from collections.abc import Iterable, Iterator
 
+from folkugat_web.dal.sql.temes import links as links_dal
 from folkugat_web.model import temes as model
 
 IMAGE_FORMATS_RE = "|".join([
@@ -30,3 +31,29 @@ def guess_link_type(url: str) -> model.LinkType | None:
             if regex.match(url):
                 return link_type
     return None
+
+
+def add_links_to_tema(tema: model.Tema) -> model.Tema:
+    if tema.id is not None:
+        tema.links = list(links_dal.get_links(tema_id=tema.id))
+    return tema
+
+
+def add_links_to_temes(temes: Iterable[model.Tema]) -> Iterator[model.Tema]:
+    return map(add_links_to_tema, temes)
+
+
+def get_link_by_id(link_id: int, tema_id: int | None = None) -> model.Link | None:
+    return next(iter(links_dal.get_links(link_id=link_id, tema_id=tema_id)), None)
+
+
+def update_link(link: model.Link):
+    links_dal.update_link(link=link)
+
+
+def delete_link(link_id: int, tema_id: int | None = None):
+    links_dal.delete_link(link_id=link_id, tema_id=tema_id)
+
+
+def create_link(tema_id: int) -> model.Link:
+    return links_dal.create_link(tema_id=tema_id)
diff --git a/folkugat_web/services/temes/lyrics.py b/folkugat_web/services/temes/lyrics.py
new file mode 100644
index 0000000..4429637
--- /dev/null
+++ b/folkugat_web/services/temes/lyrics.py
@@ -0,0 +1,30 @@
+from collections.abc import Iterable, Iterator
+
+from folkugat_web.dal.sql.temes import lyrics as lyrics_dal
+from folkugat_web.model import temes as model
+
+
+def add_lyrics_to_tema(tema: model.Tema) -> model.Tema:
+    if tema.id is not None:
+        tema.lyrics = list(lyrics_dal.get_lyrics(tema_id=tema.id))
+    return tema
+
+
+def add_lyrics_to_temes(temes: Iterable[model.Tema]) -> Iterator[model.Tema]:
+    return map(add_lyrics_to_tema, temes)
+
+
+def get_lyric_by_id(lyric_id: int, tema_id: int | None = None) -> model.Lyrics | None:
+    return next(iter(lyrics_dal.get_lyrics(lyric_id=lyric_id, tema_id=tema_id)), None)
+
+
+def update_lyric(lyric: model.Lyrics):
+    lyrics_dal.update_lyric(lyric=lyric)
+
+
+def delete_lyric(lyric_id: int, tema_id: int | None = None):
+    lyrics_dal.delete_lyric(lyric_id=lyric_id, tema_id=tema_id)
+
+
+def create_lyric(tema_id: int) -> model.Lyrics:
+    return lyrics_dal.create_lyric(tema_id=tema_id)
diff --git a/folkugat_web/services/temes/properties.py b/folkugat_web/services/temes/properties.py
new file mode 100644
index 0000000..b345b5d
--- /dev/null
+++ b/folkugat_web/services/temes/properties.py
@@ -0,0 +1,30 @@
+from collections.abc import Iterable, Iterator
+
+from folkugat_web.dal.sql.temes import properties as properties_dal
+from folkugat_web.model import temes as model
+
+
+def add_properties_to_tema(tema: model.Tema) -> model.Tema:
+    if tema.id is not None:
+        tema.properties = list(properties_dal.get_properties(tema_id=tema.id))
+    return tema
+
+
+def add_properties_to_temes(temes: Iterable[model.Tema]) -> Iterator[model.Tema]:
+    return map(add_properties_to_tema, temes)
+
+
+def get_property_by_id(property_id: int, tema_id: int | None = None) -> model.Property | None:
+    return next(iter(properties_dal.get_properties(property_id=property_id, tema_id=tema_id)), None)
+
+
+def update_property(property: model.Property):
+    properties_dal.update_property(property=property)
+
+
+def delete_property(property_id: int, tema_id: int | None = None):
+    properties_dal.delete_property(property_id=property_id, tema_id=tema_id)
+
+
+def create_property(tema_id: int) -> model.Property:
+    return properties_dal.create_property(tema_id=tema_id)
diff --git a/folkugat_web/services/temes/search.py b/folkugat_web/services/temes/search.py
index 2c9fe17..1d97112 100644
--- a/folkugat_web/services/temes/search.py
+++ b/folkugat_web/services/temes/search.py
@@ -1,7 +1,7 @@
-import functools
 import time
-import typing
-from collections.abc import Callable, Iterable
+from collections.abc import Iterable, Iterator
+from sqlite3 import Connection
+from typing import Callable
 
 import Levenshtein
 from folkugat_web.config import search as config
@@ -10,6 +10,7 @@ from folkugat_web.dal.sql.temes import query as temes_q
 from folkugat_web.log import logger
 from folkugat_web.model import search as search_model
 from folkugat_web.model import temes as model
+from folkugat_web.utils import FnChain
 
 
 def get_query_word_similarity(query_word: str, text_ngrams: search_model.NGrams) -> search_model.SearchMatch:
@@ -33,40 +34,66 @@ def get_query_similarity(query: str, ngrams: search_model.NGrams) -> search_mode
     return search_model.SearchMatch.combine_matches(word_matches)
 
 
-def build_result(query: str, entry: tuple[int, search_model.NGrams]) -> search_model.QueryResult:
-    if len(query) == 0:
+def _build_results_fn(query: str) -> Callable[[Iterable[tuple[int, search_model.NGrams]]],
+                                              Iterator[search_model.QueryResult]]:
+    def build_result(entry: tuple[int, search_model.NGrams]) -> search_model.QueryResult:
+        if len(query) == 0:
+            return search_model.QueryResult(
+                id=entry[0],
+                distance=0,
+                ngram="",
+            )
+        match = get_query_similarity(query, entry[1])
         return search_model.QueryResult(
             id=entry[0],
-            distance=0,
-            ngram="",
+            distance=match.distance,
+            ngram=match.ngram,
         )
-    match = get_query_similarity(query, entry[1])
-    return search_model.QueryResult(
-        id=entry[0],
-        distance=match.distance,
-        ngram=match.ngram,
-    )
+
+    def build_results(entries: Iterable[tuple[int, search_model.NGrams]]) -> Iterator[search_model.QueryResult]:
+        return map(build_result, entries)
+
+    return build_results
 
 
-T = typing.TypeVar("T")
+def _filter_distance(qrs: Iterable[search_model.QueryResult]) -> Iterator[search_model.QueryResult]:
+    return filter(lambda qr: qr.distance <= config.SEARCH_DISTANCE_THRESHOLD, qrs)
 
 
-@typing.no_type_check
-def _thread(it: Iterable[T], *funcs: Callable[[Iterable], Iterable]) -> Iterable:
-    return functools.reduce(lambda i, fn: fn(i), funcs, it)
+def _sort_by_distance(qrs: Iterable[search_model.QueryResult]) -> list[search_model.QueryResult]:
+    return sorted(qrs, key=lambda qr: qr.distance)
+
+
+def _query_results_to_temes(con: Connection) -> Callable[[Iterable[search_model.QueryResult]], Iterator[model.Tema]]:
+    def fetch_temes(qrs: Iterable[search_model.QueryResult]) -> Iterator[model.Tema]:
+        return filter(None, map(lambda qr: temes_q.get_tema_by_id(tema_id=qr.id, con=con), qrs))
+    return fetch_temes
+
+
+def _filter_hidden(hidden: bool) -> Callable[[Iterable[model.Tema]], Iterator[model.Tema]]:
+    def filter_hidden(temes: Iterable[model.Tema]) -> Iterator[model.Tema]:
+        return filter(lambda t: hidden or not t.hidden, temes)
+    return filter_hidden
+
+
+def _apply_limit_offset(limit: int, offset: int) -> Callable[[Iterable[model.Tema]], list[model.Tema]]:
+    def apply_limit_offset(temes: Iterable[model.Tema]) -> list[model.Tema]:
+        return list(temes)[offset:offset + limit]
+    return apply_limit_offset
 
 
 def busca_temes(query: str, hidden: bool = False, limit: int = 10, offset: int = 0) -> list[model.Tema]:
     t0 = time.time()
+
     with get_connection() as con:
-        result = _thread(
-            temes_q.get_tema_id_to_ngrams(con).items(),
-            lambda tema_id_to_ngrams: (build_result(query, entry) for entry in tema_id_to_ngrams),
-            lambda results: filter(lambda qr: qr.distance <= config.SEARCH_DISTANCE_THRESHOLD, results),
-            lambda results: sorted(results, key=lambda qr: qr.distance),
-            lambda results: filter(None, map(lambda qr: temes_q.get_tema_by_id(qr.id, con), results)),
-            lambda results: filter(lambda t: hidden or not t.hidden, results),
-        )
-        result = list(result)[offset:offset + limit]
+        result = (
+            FnChain.transform(temes_q.get_tema_id_to_ngrams(con).items()) |
+            _build_results_fn(query) |
+            _filter_distance |
+            _sort_by_distance |
+            _query_results_to_temes(con) |
+            _filter_hidden(hidden) |
+            _apply_limit_offset(limit=limit, offset=offset)
+        ).result()
     logger.info(f"Search time: { int((time.time() - t0) * 1000) } ms")
     return result
diff --git a/folkugat_web/services/temes/write.py b/folkugat_web/services/temes/write.py
index 6044b54..11efe36 100644
--- a/folkugat_web/services/temes/write.py
+++ b/folkugat_web/services/temes/write.py
@@ -7,8 +7,10 @@ from folkugat_web.model import temes as model
 
 
 def create_tema(title: str = "") -> model.Tema:
-    new_tema = model.Tema(title=title, hidden=False).with_ngrams()
-    return temes_w.insert_tema(tema=new_tema)
+    with get_connection() as con:
+        new_tema = temes_w.insert_tema(tema=model.Tema(title=title, hidden=False), con=con)
+        temes_w.update_ngrams(tema=new_tema, con=con)
+    return new_tema
 
 
 def delete_tema(tema_id: int) -> None:
@@ -21,131 +23,13 @@ def update_title(tema_id: int, title: str) -> model.Tema:
         if tema is None:
             raise ValueError(f"No tune found with tema_id = {tema_id}!")
 
-        new_tema = dataclasses.replace(tema, title=title).with_ngrams()
+        new_tema = dataclasses.replace(tema, title=title)
         temes_w.update_tema(tema=new_tema, con=con)
+        temes_w.update_ngrams(tema=new_tema, con=con)
 
     return new_tema
 
 
-def update_lyric(tema_id: int, lyric_id: int, lyric: model.Lyrics) -> model.Tema:
-    with get_connection() as con:
-        tema = temes_q.get_tema_by_id(tema_id=tema_id, con=con)
-        if tema is None:
-            raise ValueError(f"No tune found with tema_id = {tema_id}!")
-
-        tema.lyrics.replace(lyric_id, lyric)
-        temes_w.update_tema(tema=tema, con=con)
-
-    return tema
-
-
-def delete_lyric(tema_id: int, lyric_id: int) -> model.Tema:
-    with get_connection() as con:
-        tema = temes_q.get_tema_by_id(tema_id=tema_id, con=con)
-        if tema is None:
-            raise ValueError(f"No tune found with tema_id = {tema_id}!")
-
-        tema.lyrics.delete(lyric_id)
-        temes_w.update_tema(tema=tema, con=con)
-
-    return tema
-
-
-def add_lyric(tema_id: int) -> model.Tema:
-    with get_connection() as con:
-        tema = temes_q.get_tema_by_id(tema_id=tema_id, con=con)
-        if tema is None:
-            raise ValueError(f"No tune found with tema_id = {tema_id}!")
-        tema.lyrics.append(model.Lyrics(
-            id=None,
-            title=tema.title,
-            content="",
-        ))
-        temes_w.update_tema(tema=tema, con=con)
-
-    return tema
-
-
-def update_link(tema_id: int, link_id: int, link: model.Link) -> model.Tema:
-    with get_connection() as con:
-        tema = temes_q.get_tema_by_id(tema_id=tema_id, con=con)
-        if tema is None:
-            raise ValueError(f"No tune found with tema_id = {tema_id}!")
-
-        tema.links.replace(link_id, link)
-        temes_w.update_tema(tema=tema, con=con)
-
-    return tema
-
-
-def delete_link(tema_id: int, link_id: int) -> model.Tema:
-    with get_connection() as con:
-        tema = temes_q.get_tema_by_id(tema_id=tema_id, con=con)
-        if tema is None:
-            raise ValueError(f"No tune found with tema_id = {tema_id}!")
-
-        tema.links.delete(link_id)
-        temes_w.update_tema(tema=tema, con=con)
-
-    return tema
-
-
-def add_link(tema_id: int) -> model.Tema:
-    with get_connection() as con:
-        tema = temes_q.get_tema_by_id(tema_id=tema_id, con=con)
-        if tema is None:
-            raise ValueError(f"No tune found with tema_id = {tema_id}!")
-        tema.links.append(model.Link(
-            id=None,
-            title="",
-            url="",
-            content_type=model.ContentType.OTHER,
-            link_type=None,
-        ))
-        temes_w.update_tema(tema=tema, con=con)
-
-    return tema
-
-
-def update_property(tema_id: int, property_id: int, prop: model.Property) -> model.Tema:
-    with get_connection() as con:
-        tema = temes_q.get_tema_by_id(tema_id=tema_id, con=con)
-        if tema is None:
-            raise ValueError(f"No tune found with tema_id = {tema_id}!")
-
-        tema.properties.replace(property_id, prop)
-        temes_w.update_tema(tema=tema, con=con)
-
-    return tema
-
-
-def delete_property(tema_id: int, property_id: int) -> model.Tema:
-    with get_connection() as con:
-        tema = temes_q.get_tema_by_id(tema_id=tema_id, con=con)
-        if tema is None:
-            raise ValueError(f"No tune found with tema_id = {tema_id}!")
-
-        tema.properties.delete(property_id)
-        temes_w.update_tema(tema=tema, con=con)
-
-    return tema
-
-
-def add_property(tema_id: int) -> model.Tema:
-    with get_connection() as con:
-        tema = temes_q.get_tema_by_id(tema_id=tema_id, con=con)
-        if tema is None:
-            raise ValueError(f"No tune found with tema_id = {tema_id}!")
-        tema.properties.append(model.Property(
-            id=None,
-            field=model.PropertyField.AUTOR,
-            value="",
-        ))
-        temes_w.update_tema(tema=tema, con=con)
-
-    return tema
-
-
 def set_visibility(tema_id: int, hidden: bool) -> model.Tema:
     with get_connection() as con:
         tema = temes_q.get_tema_by_id(tema_id=tema_id, con=con)
diff --git a/folkugat_web/typing.py b/folkugat_web/typing.py
index 86107fc..12e841f 100644
--- a/folkugat_web/typing.py
+++ b/folkugat_web/typing.py
@@ -3,4 +3,4 @@ from typing import TypeVar
 T = TypeVar("T")
 
 ListOrValue = T | list[T]
-OptionalListOrValue = ListOrValue[T] | None
+OptionalListOrValue = T | list[T] | None
diff --git a/folkugat_web/utils.py b/folkugat_web/utils.py
index 36d5171..193cc89 100644
--- a/folkugat_web/utils.py
+++ b/folkugat_web/utils.py
@@ -1,6 +1,8 @@
+from __future__ import annotations
+
 import itertools
 from collections.abc import Callable, Iterable, Iterator
-from typing import Protocol, Self, TypeVar
+from typing import Generic, Protocol, Self, TypeVar
 
 
 class SupportsLessThan(Protocol):
@@ -20,3 +22,28 @@ def groupby(
 ) -> Iterator[tuple[KeyT, GroupT]]:
     for k, g in itertools.groupby(sorted(it, key=key_fn), key=key_fn):
         yield k, group_fn(g)
+
+
+U = TypeVar("U")
+V = TypeVar("V")
+
+
+def map_none(fn: Callable[[U], V], value: U | None) -> V | None:
+    if value is None:
+        return None
+    return fn(value)
+
+
+class FnChain(Generic[U]):
+    def __init__(self, fn: Callable[[], U], /):
+        self._fn: Callable[[], U] = fn
+
+    def __or__(self, next_fn: Callable[[U], V], /) -> FnChain[V]:
+        return FnChain(lambda: next_fn(self._fn()))
+
+    def result(self) -> U:
+        return self._fn()
+
+    @classmethod
+    def transform(cls, x: V, /) -> FnChain[V]:
+        return FnChain(lambda: x)
diff --git a/scripts/00_migrate_links.py b/scripts/00_migrate_links.py
new file mode 100644
index 0000000..1650605
--- /dev/null
+++ b/scripts/00_migrate_links.py
@@ -0,0 +1,53 @@
+import json
+from collections.abc import Iterable
+from typing import TypedDict
+
+from folkugat_web.dal.sql import get_connection
+from folkugat_web.dal.sql.temes import links as links_dal
+from folkugat_web.model.temes import ContentType, Link, LinkType
+from folkugat_web.utils import map_none
+
+query = """ SELECT id, links FROM temes """
+LinkRowTuple = tuple[int, str]
+
+
+class OldLinkRowDict(TypedDict):
+    content_type: str
+    link_type: str | None
+    title: str
+    url: str
+
+
+def _build_link(tema_id: int, link_dict: OldLinkRowDict) -> Link:
+    return Link(
+        id=None,
+        tema_id=tema_id,
+        content_type=ContentType(link_dict["content_type"]),
+        link_type=map_none(LinkType, link_dict.get("link_type")),
+        url=link_dict["url"],
+        title=link_dict["title"],
+    )
+
+
+def _build_links(row: LinkRowTuple) -> list[Link]:
+    tema_id = row[0]
+    link_dicts: list[OldLinkRowDict] = json.loads(row[1])
+    return [_build_link(tema_id, link_dict) for link_dict in link_dicts]
+
+
+with get_connection() as con:
+    cur = con.cursor()
+    _ = cur.execute(query)
+    iter_rows: Iterable[LinkRowTuple] = cur.fetchall()
+    rows = list(map(_build_links, iter_rows))
+
+    _ = cur.execute("DELETE FROM tema_links")
+    for links in rows:
+        for link in links:
+            _ = links_dal.insert_link(link=link, con=con)
+
+    drop_query = """ ALTER TABLE temes DROP COLUMN links"""
+    _ = cur.execute(drop_query)
+
+
+print("DONE!")
diff --git a/scripts/01_migrate_lyrics.py b/scripts/01_migrate_lyrics.py
new file mode 100644
index 0000000..99118e6
--- /dev/null
+++ b/scripts/01_migrate_lyrics.py
@@ -0,0 +1,48 @@
+import json
+from collections.abc import Iterable
+from typing import TypedDict
+
+from folkugat_web.dal.sql import get_connection
+from folkugat_web.dal.sql.temes import lyrics as lyrics_dal
+from folkugat_web.model.temes import Lyrics
+
+query = """ SELECT id, lyrics FROM temes """
+LyricRowTuple = tuple[int, str]
+
+
+class OldLyricRowDict(TypedDict):
+    title: str
+    content: str
+
+
+def _build_lyric(tema_id: int, lyric_dict: OldLyricRowDict) -> Lyrics:
+    return Lyrics(
+        id=None,
+        tema_id=tema_id,
+        title=lyric_dict["title"],
+        content=lyric_dict["content"],
+    )
+
+
+def _build_lyrics(row: LyricRowTuple) -> list[Lyrics]:
+    tema_id = row[0]
+    lyric_dicts: list[OldLyricRowDict] = json.loads(row[1])
+    return [_build_lyric(tema_id, lyric_dict) for lyric_dict in lyric_dicts]
+
+
+with get_connection() as con:
+    cur = con.cursor()
+    _ = cur.execute(query)
+    iter_rows: Iterable[LyricRowTuple] = cur.fetchall()
+    rows = list(map(_build_lyrics, iter_rows))
+
+    _ = cur.execute("DELETE FROM tema_lyrics")
+    for lyrics in rows:
+        for lyric in lyrics:
+            _ = lyrics_dal.insert_lyric(lyric=lyric, con=con)
+
+    drop_query = """ ALTER TABLE temes DROP COLUMN lyrics"""
+    _ = cur.execute(drop_query)
+
+
+print("DONE!")
diff --git a/scripts/02_migrate_properties.py b/scripts/02_migrate_properties.py
new file mode 100644
index 0000000..dd9f524
--- /dev/null
+++ b/scripts/02_migrate_properties.py
@@ -0,0 +1,48 @@
+import json
+from collections.abc import Iterable
+from typing import TypedDict
+
+from folkugat_web.dal.sql import get_connection
+from folkugat_web.dal.sql.temes import properties as properties_dal
+from folkugat_web.model.temes import Property, PropertyField
+
+query = """ SELECT id, properties FROM temes """
+PropertyRowTuple = tuple[int, str]
+
+
+class OldPropertyRowDict(TypedDict):
+    field: str
+    value: str
+
+
+def _build_property(tema_id: int, property_dict: OldPropertyRowDict) -> Property:
+    return Property(
+        id=None,
+        tema_id=tema_id,
+        field=PropertyField(property_dict["field"]),
+        value=property_dict["value"],
+    )
+
+
+def _build_properties(row: PropertyRowTuple) -> list[Property]:
+    tema_id = row[0]
+    property_dicts: list[OldPropertyRowDict] = json.loads(row[1])
+    return [_build_property(tema_id, property_dict) for property_dict in property_dicts]
+
+
+with get_connection() as con:
+    cur = con.cursor()
+    _ = cur.execute(query)
+    iter_rows: Iterable[PropertyRowTuple] = cur.fetchall()
+    rows = list(map(_build_properties, iter_rows))
+
+    _ = cur.execute("DELETE FROM tema_properties")
+    for properties in rows:
+        for property in properties:
+            _ = properties_dal.insert_property(property=property, con=con)
+
+    drop_query = """ ALTER TABLE temes DROP COLUMN properties"""
+    _ = cur.execute(drop_query)
+
+
+print("DONE!")