Package com.iizix.server.push.engine.store

Supplies database connections to the store: the server's pool in production (DBUtilities::getPooledConnection), an in-memory database in a test.

The subscription table IZS.SUBSCRIPTIONS: one row per (user, application, Topic, device), carrying the transport and what it needs, plus the device's last-seen address.

The Destination field's lookup: user names and e-mail addresses, case-insensitive, with the * wildcard, resolved to user IDs against IZS.USERS.