Add audit logging functionality with database schema and event handling

db/migrations/000002_create_audit_table.up.sql

@@ -0,0 +1,14 @@
+create table audit_logs
+(
+    id        VARCHAR(26)  not null
+        constraint audit_logs_pkey
+            primary key,
+    user_id   integer,
+    action    varchar(255) not null,
+    timestamp timestamptz default current_timestamp,
+    details   jsonb
+);
+
+create index idx_audit_logs_action on audit_logs (action);
+create index idx_audit_logs_user_id on audit_logs (user_id);
+create index idx_audit_logs_timestamp on audit_logs (timestamp);