Let people name accounts and use the names to tell accounts apart

Connections get an account_name (migration 0039) that the owner sets with
PATCH /api/connections/<id>; the account label stays the account's
identity, so signing in again still finds it. When someone has more than
one account of a service, its tools are listed as "Telegram · <account>"
and the model sees each account's actions under the account's name
(telegram_send_message_alerts_bot) with the account in the description,
instead of _1 and _2. Actions shared by different services are named
after the service. Tools a user renamed keep their name.

docsgpt/storage/db/models.py

@@ -608,6 +608,9 @@ connector_sessions_table = Table(
     Column("scopes", JSONB, nullable=False, server_default="[]"),
     Column("last_error", Text),
     Column("last_used_at", DateTime(timezone=True)),
+    # Added in ``0039_connection_account_name``: what the user calls the
+    # account; ``account_label`` stays its identity.
+    Column("account_name", Text),
 )
 
 

docsgpt/storage/db/repositories/connector_sessions.py

@@ -36,7 +36,7 @@ from docsgpt.storage.db.serialization import PGNativeJSONEncoder
 _UPDATABLE_SCALARS = {
     "server_url", "session_token", "user_email", "status", "expires_at",
     "connector_key", "display_name", "account_label", "auth_kind",
-    "encrypted_credentials", "has_refresh_token", "last_error", "last_used_at",
+    "encrypted_credentials", "has_refresh_token", "last_error", "last_used_at", "account_name",
 }
 _UPDATABLE_JSONB = {"session_data", "token_info", "scopes"}