Afegir cartells a les jams (i esquelet per a slow jams i notes)

scripts/04_add_session_notes_i_cartell.py

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+from folkugat_web.dal.sql import get_connection
+
+with get_connection() as con:
+    cur = con.cursor()
+    alter_query_1 = """ ALTER TABLE sessions ADD COLUMN notes TEXT """
+    alter_query_2 = """ ALTER TABLE sessions ADD COLUMN cartell_url TEXT """
+    _ = cur.execute(alter_query_1)
+    _ = cur.execute(alter_query_2)
+
+print("DONE!")