current_database 
------------------
 signalk
(1 row)

You are now connected to database "signalk" as user "username".
Expanded display is on.
-[ RECORD 1 ]
vessel_id | t

api.metadata details
-[ RECORD 1 ]---+----------------
id              | 2
name            | aava
mmsi            | 787654321
length          | 12
beam            | 10
height          | 24
ship_type       | 37
plugin_version  | 1.0.2
signalk_version | 1.20.0
time            | t
active          | t
configuration   | 
available_keys  | []
-[ RECORD 2 ]---+----------------
id              | 1
name            | kapla
mmsi            | 123456789
length          | 12
beam            | 10
height          | 24
ship_type       | 36
plugin_version  | 0.0.1
signalk_version | signalk_version
time            | t
active          | t
configuration   | 
available_keys  | 

api.metadata get configuration
-[ RECORD 1 ]-+-
configuration | 

api.metadata update configuration
UPDATE 1
api.metadata get configuration with new value
-[ RECORD 1 ]----------------------------------
depthkey  | "environment.depth.belowTransducer"
update_at | t

api.metadata get configuration base on update_at value
-[ RECORD 1 ]----------------------------------
depthkey  | "environment.depth.belowTransducer"
update_at | t