Refactor: Change table chat_channel status data type. (#16061)

### What problem does this PR solve?

As title.

### Type of change

- [x] Refactoring

api/db/db_models.py

@@ -1254,7 +1254,7 @@ class ChatChannel(DataBaseModel):
     channel = CharField(max_length=128, null=False, help_text="Chat channel type", index=True)
     config = JSONField(null=False, default={}, help_text="Channel credential & settings")
     dialog_id = CharField(max_length=32, null=True, default=None, help_text="connected dialog id", index=True)
-    status = CharField(max_length=16, null=True, help_text="1: valid, 0: invalid", default="1", index=True)
+    status = IntegerField(default=1, index=True)
 
     def __str__(self):
         return self.name
@@ -1777,6 +1777,7 @@ def migrate_db():
     alter_db_column_type(migrator, "document", "size", BigIntegerField(default=0, index=True))
     alter_db_column_type(migrator, "file", "size", BigIntegerField(default=0, index=True))
     alter_db_add_column(migrator, "tenant", "ocr_id", CharField(max_length=128, null=True, help_text="default ocr model ID", index=True))
+    alter_db_column_type(migrator, "chat_channel", "status", IntegerField(default=1, index=True))
     # Drop both the explicit "idx_*" name from later migrations AND the
     # Peewee-auto-derived "<table-as-classname>_<col1>_<col2>" name from the
     # original TenantModelInstance definition (commit dc4b82523). Databases

api/db/services/chat_channel_service.py

@@ -54,7 +54,7 @@ class ChatChannelService(CommonService):
     @DB.connection_context()
     def list_active(cls):
         """Return all enabled chat channel bots across tenants (with credentials)."""
-        return list(cls.model.select().where(cls.model.status == "1"))
+        return list(cls.model.select().where(cls.model.status == 1))
 
     @classmethod
     @DB.connection_context()