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b03d0a206b
This adds a new table to the database to hold message dependencies. It introduces two more message states: pending and delivered The valid column in the database was renamed to state to better reflect its new extended meaning. The DatabaseComponent was extended with three methods for: * adding dependencies * getting dependencies of a message * getting messages that depend on a message (dependents) * getting messages to be delivered (by startup hook) * getting pending messages to be possibly delivered (by startup hook) In order to reflect the new states, things that were previously true for VALID messages have been changed to now be true for DELIVERED messages. Since pending messages should not be available to clients, many database queries have been modified to only return results for delivered messages. All added methods and changes should come with updated unit tests. Please note that the database version was bumped in this commit.
Briar is a messaging app designed for activists, journalists, and anyone else who needs a safe, easy and robust way to communicate. Unlike traditional messaging tools such as email, Twitter or Telegram, Briar doesn't rely on a central server - messages are synchronized directly between the users' devices. If the Internet's down, Briar can sync via Bluetooth or Wi-Fi, keeping the information flowing in a crisis. If the Internet's up, Briar can sync via the Tor network, protecting users and their relationships from surveillance.