feat(watcher,api,frontend): watched bots become accounts and drain the update backlog

backend/migrations/versions/e2c9a41f7b68_bot_accounts.py

@@ -0,0 +1,61 @@
+"""bot accounts
+
+Revision ID: e2c9a41f7b68
+Revises: c8f3b6a2d571
+Create Date: 2026-09-18 16:00:00.000000
+
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+
+revision: str = "e2c9a41f7b68"
+down_revision: str | None = "c8f3b6a2d571"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+_ACCOUNTS = """
+INSERT INTO accounts
+    (tg_user_id, label, phone, session_name, is_active, is_bot, raw)
+SELECT b.bot_id,
+       coalesce(b.title, '@' || b.username, b.bot_id::text),
+       NULL,
+       b.bot_id::text,
+       b.enabled,
+       true,
+       jsonb_build_object('id', b.bot_id, 'username', b.username,
+                          'first_name', b.title)
+FROM watched_bots b
+ON CONFLICT (tg_user_id) DO NOTHING
+"""
+
+_LINK = """
+UPDATE watched_bots b SET account_id = a.account_id
+FROM accounts a WHERE a.tg_user_id = b.bot_id
+"""
+
+_MERGE_MESSAGES = """
+INSERT INTO messages
+    (account_id, chat_id, message_id, date, sender_id, text, raw, has_media)
+SELECT b.account_id, u.chat_id, u.item_id, u.ts, u.sender_id, u.text, u.raw,
+       u.media_kind IS NOT NULL
+FROM bot_updates u
+JOIN watched_bots b ON b.bot_id = u.bot_id
+WHERE u.kind = 'message' AND b.account_id IS NOT NULL
+ON CONFLICT (account_id, chat_id, message_id, date) DO NOTHING
+"""
+
+
+def upgrade() -> None:
+    op.execute("ALTER TABLE accounts ADD COLUMN is_bot boolean NOT NULL DEFAULT false")
+    op.execute("ALTER TABLE watched_bots ADD COLUMN account_id integer")
+    op.execute(_ACCOUNTS)
+    op.execute(_LINK)
+    op.execute(_MERGE_MESSAGES)
+    op.execute("DROP TABLE IF EXISTS bot_updates")
+
+
+def downgrade() -> None:
+    op.execute("ALTER TABLE watched_bots DROP COLUMN IF EXISTS account_id")
+    op.execute("ALTER TABLE accounts DROP COLUMN IF EXISTS is_bot")