WIP Logging service and API.

api/src/main/sql/migrations/20190227225053-logging-down.sql

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+-- DOWN script for logging (20190227225053)
+drop table client_log_entries;

api/src/main/sql/migrations/20190227225053-logging-up.sql

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+-- UP script for logging (20190227225053)
+create table client_log_entries (
+  id serial primary key,
+  user_id uuid not null references users (id),
+  "level" varchar not null,
+  "scope" varchar not null,
+  message varchar not null,
+  stacktrace varchar not null,
+  "timestamp" timestamp with time zone not null default current_timestamp
+);
+
+create index client_log_entries_by_level on client_log_entries ("level");