This page hosts the detailed specification for the [https://blueprints.launchpad.net/sahana3/+spec/synchronisation Blueprint for the Synchronisation].

We need to be able to support synchronising data between instances

In S2 this is done by record ids being UUIDs (Universally Unique IDs) built from each instance's 'base_uuid'

There is a sync_instance table:
{{{
CREATE TABLE sync_instance (
    base_uuid VARCHAR(4) NOT NULL, -- Instance id
    owner VARCHAR(100), -- Instance owner's name
    contact TEXT, -- Contact details of the instance owner
    url VARCHAR(100) DEFAULT NULL, -- Server url if exists
    last_update TIMESTAMP NOT NULL, -- Last Time sync with the instance
    sync_count INT DEFAULT 0, -- Number of times synchronized
    PRIMARY KEY(base_uuid)
);
}}}