telegram_backup: order messages by date and users/chats by id for det…

…erminism

my/telegram/telegram_backup.py

@@ -62,6 +62,8 @@ def permalink(self) -> str:
 Chats = Dict[str, Chat]
 def _message_from_row(r: sqlite3.Row, *, chats: Chats) -> Message:
  ts = r['time']
+ # desktop export uses UTC (checked by exporting in winter time vs summer time)
+ # and telegram_backup timestamps seem same as in desktop export
  time = datetime.fromtimestamp(ts, tz=timezone.utc)
  chat = chats[r['source_id']]
  sender = chats[r['sender_id']]
@@ -78,12 +80,12 @@ def messages() -> Iterator[Message]:
  with sqlite_connection(config.export_path, immutable=True, row_factory='row') as db:
 
  chats: Chats = {}
- for r in db.execute('SELECT * FROM chats'):
+ for r in db.execute('SELECT * FROM chats ORDER BY id'):
  chat = Chat(id=r['id'], name=r['name'], handle=None)
  assert chat.id not in chats
  chats[chat.id] = chat
 
- for r in db.execute('SELECT * FROM users'):
+ for r in db.execute('SELECT * FROM users ORDER BY id'):
  first = r["first_name"]
  last = r["last_name"]
  name: Optional[str]
@@ -96,8 +98,7 @@ def messages() -> Iterator[Message]:
  assert chat.id not in chats
  chats[chat.id] = chat
 
- # TODO order by? not sure
- for r in db.execute('SELECT * FROM messages WHERE message_type NOT IN ("service_message", "empty_message")'):
+ for r in db.execute('SELECT * FROM messages WHERE message_type NOT IN ("service_message", "empty_message") ORDER BY time'):
  # seems like the only remaining have message_type = 'message'
  yield _message_from_row(r, chats=chats)