feat: add system tools and state updates

backend/migrations/versions/20260804_0010_add_assistant_system_tools.py

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+"""add assistant system tools
+
+Revision ID: 20260804_0010
+Revises: 20260801_0009
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = "20260804_0010"
+down_revision: str | Sequence[str] | None = "20260801_0009"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "assistants",
+        sa.Column(
+            "system_tools",
+            sa.JSON(),
+            server_default=sa.text("'[]'"),
+            nullable=False,
+        ),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("assistants", "system_tools")

backend/migrations/versions/20260804_0011_tool_end_call_to_system.py

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+"""move end conversation tools into the system category
+
+Revision ID: 20260804_0011
+Revises: 20260804_0010
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+
+
+revision: str = "20260804_0011"
+down_revision: str | Sequence[str] | None = "20260804_0010"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    op.execute(
+        """
+        UPDATE tools
+        SET type = 'system',
+            definition = jsonb_set(
+                jsonb_set(definition, '{type}', '"system"'::jsonb),
+                '{config,kind}',
+                '"end_conversation"'::jsonb,
+                true
+            )
+        WHERE type = 'end_call'
+        """
+    )
+
+
+def downgrade() -> None:
+    op.execute(
+        """
+        UPDATE tools
+        SET type = 'end_call',
+            definition = (definition #- '{config,kind}')
+                || '{"type":"end_call"}'::jsonb
+        WHERE type = 'system'
+          AND definition #>> '{config,kind}' = 'end_conversation'
+        """
+    )