🚧 Major refactor of backend code.

Relevant changes:

- ring -> vertx
- suricatta -> vertx-pgsql
- emails improvements
- logging
- hybrid sync/async -> full async execution model
- database layout refactor

backend/resources/migrations/0003.projects.up.sql

@@ -2,13 +2,12 @@
 
 CREATE TABLE IF NOT EXISTS projects (
   id uuid PRIMARY KEY DEFAULT uuid_generate_v4(),
-  "user" uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
 
   created_at timestamptz NOT NULL DEFAULT clock_timestamp(),
   modified_at timestamptz NOT NULL DEFAULT clock_timestamp(),
   deleted_at timestamptz DEFAULT NULL,
 
-  version bigint NOT NULL DEFAULT 0,
   name text NOT NULL
 );
 
@@ -23,7 +22,7 @@ CREATE TABLE IF NOT EXISTS project_shares (
 -- Indexes
 
 CREATE INDEX projects_user_idx
-    ON projects("user");
+    ON projects(user_id);
 
 CREATE UNIQUE INDEX projects_shares_token_idx
     ON project_shares(token);
@@ -49,10 +48,6 @@ CREATE TRIGGER project_on_create_tgr
  AFTER INSERT ON projects
    FOR EACH ROW EXECUTE PROCEDURE handle_project_create();
 
-CREATE TRIGGER project_occ_tgr
-BEFORE UPDATE ON projects
-   FOR EACH ROW EXECUTE PROCEDURE handle_occ();
-
 CREATE TRIGGER projects_modified_at_tgr
 BEFORE UPDATE ON projects
    FOR EACH ROW EXECUTE PROCEDURE update_modified_at();