Android tests are failing

The tests that assert the pre-populated message count are failing due to the deletion logic in the 'Add second message' feature, which results in only one pre-populated message.

The expected message count is 2, but actual message count is 1.

```
fun SupportSQLiteDatabase.populateInitialData() {
...

// Add second message <<< This one is removed.
insert(
table = "Message",
conflictAlgorithm = SQLiteDatabase.CONFLICT_NONE,
values = ContentValues().apply {
put("id", (index * 2).toLong() + 1L)
put("chatId", chatIds[index])
put("senderId", contact.id)
put("text", "I will reply in 5 seconds")
put("timestamp", now + chatIds[index])
},
)
...
}
```

Run the failing Android tests and inspect populateInitialData(), especially the deletion logic around the “Add second message” feature. Confirm why the inserted second Message is removed, then verify the pre-populated data contains two messages per expected case and the tests pass.

Written by the indexing model from the issue text.