feat(db): add migration to simplify agent architecture

- Add migration to delete user_agents table and memories.agent_id
- Rename user_agent_catalog to system_agents
- Remove UserAgents model
- Rename UserAgentCatalog to SystemAgents model

backend/src/models/__init__.py

@@ -13,10 +13,9 @@ from models.memories import Memory
 from models.profile import Profile
 from models.schedule_items import ScheduleItem
 from models.schedule_subscriptions import ScheduleSubscription
+from models.system_agents import SystemAgents
 from models.todos import Todo
 from models.todo_sources import TodoSource
-from models.user_agents import UserAgent
-from models.user_agent_catalog import UserAgentCatalog
 
 __all__ = [
     "AgentChatMessage",
@@ -33,8 +32,7 @@ __all__ = [
     "Profile",
     "ScheduleItem",
     "ScheduleSubscription",
+    "SystemAgents",
     "Todo",
     "TodoSource",
-    "UserAgent",
-    "UserAgentCatalog",
 ]

backend/src/models/system_agents.py

@@ -9,8 +9,8 @@ from sqlalchemy.orm import Mapped, mapped_column
 from core.db.base import Base, TimestampMixin
 
 
-class UserAgentCatalog(TimestampMixin, Base):
-    __tablename__: str = "user_agent_catalog"
+class SystemAgents(TimestampMixin, Base):
+    __tablename__: str = "system_agents"
 
     agent_type: Mapped[str] = mapped_column(
         String(20),

backend/src/models/user_agents.py

@@ -1,62 +0,0 @@
-from __future__ import annotations
-
-import uuid
-from enum import Enum
-
-from sqlalchemy import String
-from sqlalchemy.dialects.postgresql import JSONB, UUID
-from sqlalchemy.orm import Mapped, mapped_column
-
-from core.db.base import Base, SoftDeleteMixin, TimestampMixin
-
-
-class UserAgentStatus(str, Enum):
-    ACTIVE = "active"
-    PAUSED = "paused"
-    MIGRATING = "migrating"
-
-
-class AgentType(str, Enum):
-    INTENT_RECOGNITION = "INTENT_RECOGNITION"
-    TASK_EXECUTION = "TASK_EXECUTION"
-    RESULT_REPORTING = "RESULT_REPORTING"
-
-
-class UserAgent(TimestampMixin, SoftDeleteMixin, Base):
-    __tablename__: str = "user_agents"
-    __table_args__ = {"extend_existing": True}
-
-    id: Mapped[uuid.UUID] = mapped_column(
-        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
-    )
-    user_id: Mapped[uuid.UUID] = mapped_column(
-        UUID(as_uuid=True),
-        nullable=False,
-        unique=True,
-    )
-    llm_id: Mapped[uuid.UUID] = mapped_column(
-        UUID(as_uuid=True),
-        nullable=False,
-    )
-    agent_type: Mapped[AgentType] = mapped_column(
-        String(20),
-        nullable=False,
-    )
-    config: Mapped[dict] = mapped_column(
-        JSONB,
-        nullable=False,
-        server_default="{}",
-    )
-    status: Mapped[UserAgentStatus] = mapped_column(
-        String(20),
-        nullable=False,
-        default=UserAgentStatus.ACTIVE,
-    )
-    created_by: Mapped[uuid.UUID | None] = mapped_column(
-        UUID(as_uuid=True),
-        nullable=True,
-    )
-    updated_by: Mapped[uuid.UUID | None] = mapped_column(
-        UUID(as_uuid=True),
-        nullable=True,
-    )