dbsync_srvapp: Server app module

Table 1. DB Sync server app module (dbsync_srvapp.4gl)
Function	Description
`FUNCTION central_change_cancel()`	Central changes cancelation function.
`FUNCTION central_change_done()`	Central changes termination function.
`FUNCTION central_change_init( tablist STRING ) RETURNS INTEGER`	Central changes initialization function.
`FUNCTION central_set_sync_timestamp()`	Registers the point in time of last central data refresh.
`FUNCTION cleanup()`	Terminate module usage.
`FUNCTION initialize()`	DBSync server app lib initialization.
`FUNCTION is_row_referenced( table_name STRING, jo_data util.JSONObject ) RETURNS BOOLEAN`	Checks if a given row is still referenced in other tables by foreign key.
`FUNCTION register_central_app_params( dbschema_filename STRING, app_id dbsync_core.t_app_id, user_id dbsync_core.t_user_id )`	Registers parameters for the DB Sync server-side app.
`FUNCTION register_central_delete( tabname STRING, pkeyval BIGINT ) RETURNS INTEGER`	Register dbsync delete for a given central row.
`FUNCTION register_central_delete_cpk2( tabname STRING, pkeyval_1 BIGINT, pkeyval_2 BIGINT ) RETURNS INTEGER`	Register dbsync delete for a given central row with a 2-col integer pkey.
`FUNCTION register_central_delete_cpk3_s( tabname STRING, pkeyval_1 STRING, pkeyval_2 STRING, pkeyval_3 STRING ) RETURNS INTEGER`	Register dbsync delete for a given central row with a composite pkey.
`FUNCTION register_central_delete_s( tabname STRING, pkeyval STRING ) RETURNS INTEGER`	Same as `register_central_delete()` but with string column.
`FUNCTION register_central_insert( tabname STRING, pkeyval BIGINT ) RETURNS INTEGER`	Register dbsync insert for a given central row.
`FUNCTION register_central_insert_cpk2( tabname STRING, pkeyval_1 BIGINT, pkeyval_2 BIGINT ) RETURNS INTEGER`	Register dbsync insert for a given central row with a 2-col integer pkey.
`FUNCTION register_central_insert_cpk3_s( tabname STRING, pkeyval_1 STRING, pkeyval_2 STRING, pkeyval_3 STRING ) RETURNS INTEGER`	Register dbsync insert for a given central row with a composite pkey.
`FUNCTION register_central_insert_s( tabname STRING, pkeyval STRING ) RETURNS INTEGER`	Same as `register_central_insert()` but with string column.
`FUNCTION register_central_update( tabname type1, pkeyval type2 ) RETURNS INTEGER`	Register dbsync update for a given central row.
`FUNCTION register_central_update_cpk2( tabname STRING, pkeyval_1 BIGINT, pkeyval_2 BIGINT ) RETURNS INTEGER`	Register dbsync update for a given central row with a 2-col integer pkey.
`FUNCTION register_central_update_cpk3_s( tabname STRING, pkeyval_1 STRING, pkeyval_2 STRING, pkeyval_3 STRING ) RETURNS INTEGER`	Register dbsync update for a given central row with a composite pkey.
`FUNCTION register_central_update_s( tabname STRING, pkeyval STRING ) RETURNS INTEGER`	Same as `register_central_update()` but with string column.