feat: add boards and tasks management endpoints

backend/app/models/tasks.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+from datetime import datetime
+from uuid import UUID, uuid4
+
+from sqlmodel import Field
+
+from app.models.tenancy import TenantScoped
+
+
+class Task(TenantScoped, table=True):
+    __tablename__ = "tasks"
+
+    id: UUID = Field(default_factory=uuid4, primary_key=True)
+    board_id: UUID | None = Field(default=None, foreign_key="boards.id", index=True)
+
+    title: str
+    description: str | None = None
+    status: str = Field(default="inbox", index=True)
+    priority: str = Field(default="medium", index=True)
+    due_at: datetime | None = None
+
+    created_by_user_id: UUID | None = Field(default=None, foreign_key="users.id", index=True)
+
+    created_at: datetime = Field(default_factory=datetime.utcnow)
+    updated_at: datetime = Field(default_factory=datetime.utcnow)