Add monitoring TG service

alembic/versions/0006_add_app_settings.py

@@ -0,0 +1,35 @@
+"""key/value store for runtime-editable settings (LLM prompt, etc.)
+
+Revision ID: 0006
+Revises: 0005
+Create Date: 2026-05-06
+
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.dialects import postgresql
+
+revision: str = "0006"
+down_revision: Union[str, None] = "0005"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "app_settings",
+        sa.Column("key", sa.String(length=64), primary_key=True),
+        sa.Column("value", postgresql.JSONB(), nullable=False),
+        sa.Column(
+            "updated_at",
+            sa.DateTime(timezone=True),
+            nullable=False,
+            server_default=sa.func.now(),
+        ),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("app_settings")