Message IDs: Unique identifiers for each message.

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Sender and Recipient IDs: Who sent the message and who it's intended for.
Timestamp: When the message was sent/received by the server.
Delivery Status: Flags indicating if a message is sent, delivered, or read (the "ticks"). These are ephemeral and updated as messages are delivered.
Queue for Undelivered Messages: As mentioned, encrypted messages are temporarily stored in a queue if the recipient is offline.
Media References:

When you send a media file, the file itself is stored in encrypted form in a separate blob storage (like S3 or Google Cloud Storage, or Meta's internal equivalent).
The database stores a reference (like a URL or ID) to this encrypted slovenia phone number list media file, which is then sent within the encrypted message content to the recipient. The recipient's device then fetches the media using this reference.
Diagnostic and Log Data:

System performance metrics, error logs, crash reports, and other diagnostic information crucial for monitoring and improving the service. This data is often anonymized or aggregated for analysis.
Business Account Information:

Profiles, settings, and potentially some interaction data for WhatsApp Business API users, as businesses can handle their own data retention and processing once messages reach their systems.