Add monitoring TG service

alembic/versions/0003_add_grouped_id.py

@@ -0,0 +1,39 @@
+"""add grouped_id to messages (Telegram album/media-group key)
+
+Revision ID: 0003
+Revises: 0002
+Create Date: 2026-05-05
+
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0003"
+down_revision: Union[str, None] = "0002"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column("messages", sa.Column("grouped_id", sa.BigInteger(), nullable=True))
+    op.create_index(
+        "ix_messages_grouped_id", "messages", ["channel_id", "grouped_id"]
+    )
+    # Backfill grouped_id from the stored raw JSONB for existing rows so that
+    # albums saved before this migration are grouped retroactively.
+    op.execute(
+        """
+        UPDATE messages
+        SET grouped_id = (raw->>'grouped_id')::bigint
+        WHERE grouped_id IS NULL
+          AND raw IS NOT NULL
+          AND raw->>'grouped_id' IS NOT NULL
+        """
+    )
+
+
+def downgrade() -> None:
+    op.drop_index("ix_messages_grouped_id", table_name="messages")
+    op.drop_column("messages", "grouped_id")