/usr/share/kamailio/db_berkeley/kamailio/watchers is in kamailio-berkeley-modules 4.2.0-2+deb8u3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | METADATA_COLUMNS
id(int) presentity_uri(str) watcher_username(str) watcher_domain(str) event(str) status(int) reason(str) inserted_time(int)
METADATA_KEY
1 4
METADATA_READONLY
0
METADATA_LOGFLAGS
0
METADATA_DEFAULTS
NIL|NIL|NIL|NIL|'presence'|NIL|NIL|NIL
|