feat(beatmapset): support post favoutite to beatmapset

app/database/favourite_beatmapset.py

@@ -0,0 +1,53 @@
+import datetime
+
+from app.database.beatmapset import Beatmapset
+from app.database.lazer_user import User
+
+from sqlalchemy.ext.asyncio import AsyncAttrs
+from sqlmodel import (
+    BigInteger,
+    Column,
+    DateTime,
+    Field,
+    ForeignKey,
+    Relationship,
+    SQLModel,
+)
+
+
+class FavouriteBeatmapset(AsyncAttrs, SQLModel, table=True):
+    __tablename__ = "favourite_beatmapset"  # pyright: ignore[reportAssignmentType]
+    id: int | None = Field(
+        default=None,
+        sa_column=Column(BigInteger, autoincrement=True, primary_key=True),
+        exclude=True,
+    )
+    user_id: int = Field(
+        default=None,
+        sa_column=Column(
+            BigInteger,
+            ForeignKey("lazer_users.id"),
+            index=True,
+        ),
+    )
+    beatmapset_id: int = Field(
+        default=None,
+        sa_column=Column(
+            ForeignKey("beatmapsets.id"),
+            index=True,
+        ),
+    )
+    date: datetime.datetime = Field(
+        default=datetime.datetime.now(datetime.UTC),
+        sa_column=Column(
+            DateTime,
+        ),
+    )
+
+    user: User = Relationship(back_populates="favourite_beatmapsets")
+    beatmapset: Beatmapset = Relationship(
+        sa_relationship_kwargs={
+            "lazy": "selectin",
+        },
+        back_populates="favourites",
+    )