Refactor Playlist model and add timestamps migration

Simplifies the PlaylistBase id field to a non-optional int and updates database logic to use session.refresh for id assignment. Adds Alembic migration to include created_at and updated_at columns in room_playlists for timestamp tracking.

app/database/playlists.py

@@ -26,11 +26,7 @@ if TYPE_CHECKING:
 
 
 class PlaylistBase(SQLModel, UTCBaseModel):
-    id: int | None = Field(
-        default=None,
-        primary_key=True,
-        index=True,
-    )
+    id: int = Field(index=True)
     owner_id: int = Field(sa_column=Column(BigInteger, ForeignKey("lazer_users.id")))
     ruleset_id: int = Field(ge=0, le=3)
     expired: bool = Field(default=False)
@@ -120,11 +116,9 @@ class Playlist(PlaylistBase, table=True):
     async def add_to_db(cls, playlist: PlaylistItem, room_id: int, session: AsyncSession):
         db_playlist = await cls.from_hub(playlist, room_id, session)
         session.add(db_playlist)
-        await session.flush()
-        assert db_playlist.id is not None, "db_playlist.id should be set after flush"
-        playlist.id = db_playlist.id 
         await session.commit()
-
+        await session.refresh(db_playlist)
+        playlist.id = db_playlist.id
 
     @classmethod
     async def delete_item(cls, item_id: int, room_id: int, session: AsyncSession):
@@ -145,4 +139,4 @@ class PlaylistResp(PlaylistBase):
         if "beatmap" in include:
             data["beatmap"] = await BeatmapResp.from_db(playlist.beatmap)
         resp = cls.model_validate(data)
-        return resp
+        return resp

migrations/versions/3f890a76f036_add_id_data.py

@@ -0,0 +1,39 @@
+"""add id data
+
+Revision ID: 3f890a76f036
+Revises: 8d2af11343b9
+Create Date: 2025-08-24 04:00:02.063347
+
+"""
+from __future__ import annotations
+
+from collections.abc import Sequence
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision: str = "3f890a76f036"
+down_revision: str | Sequence[str] | None = "8d2af11343b9"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    #op.drop_index(op.f("ix_lazer_user_achievements_achievement_id"), table_name="lazer_user_achievements")
+    #op.drop_index(op.f("uq_user_achievement"), table_name="lazer_user_achievements")
+    op.add_column("room_playlists", sa.Column("created_at", sa.DateTime(), server_default=sa.text("now()"), nullable=True))
+    op.add_column("room_playlists", sa.Column("updated_at", sa.DateTime(), server_default=sa.text("now()"), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column("room_playlists", "updated_at")
+    op.drop_column("room_playlists", "created_at")
+    op.create_index(op.f("uq_user_achievement"), "lazer_user_achievements", ["user_id", "achievement_id"], unique=True)
+    op.create_index(op.f("ix_lazer_user_achievements_achievement_id"), "lazer_user_achievements", ["achievement_id"], unique=False)
+    # ### end Alembic commands ###