feat(user): add monthly playcounts

app/database/monthly_playcounts.py

@@ -0,0 +1,43 @@
+from datetime import date
+from typing import TYPE_CHECKING
+
+from sqlmodel import (
+    BigInteger,
+    Column,
+    Field,
+    ForeignKey,
+    Relationship,
+    SQLModel,
+)
+
+if TYPE_CHECKING:
+    from .lazer_user import User
+
+
+class MonthlyPlaycounts(SQLModel, table=True):
+    __tablename__ = "monthly_playcounts"  # pyright: ignore[reportAssignmentType]
+
+    id: int | None = Field(
+        default=None,
+        sa_column=Column(BigInteger, primary_key=True, autoincrement=True),
+    )
+    user_id: int = Field(
+        sa_column=Column(BigInteger, ForeignKey("lazer_users.id"), index=True)
+    )
+    year: int = Field(index=True)
+    month: int = Field(index=True)
+    playcount: int = Field(default=0)
+
+    user: "User" = Relationship(back_populates="monthly_playcounts")
+
+
+class MonthlyPlaycountsResp(SQLModel):
+    start_date: date
+    count: int
+
+    @classmethod
+    def from_db(cls, db_model: MonthlyPlaycounts) -> "MonthlyPlaycountsResp":
+        return cls(
+            start_date=date(db_model.year, db_model.month, 1),
+            count=db_model.playcount,
+        )