Tags: OpenSeaMap/depth_api

Extend database to record depth sensor offsets and gps sensor offsets

Merge pull request #1 from dfa/master

Vessel API

Change data type for track_id

The data type for the track_id has been changed from
integer (4 bytes) to bigint (8 bytes).

Fix session username

The username has to be stored in the session as hashed value,
because other API implementations (like tracks) use this session
key to reference to the account. Otherwise the account reference
is stored as clear text, what we won't.