feat: Implement multi-database architecture

This commit introduces a three-database architecture to the application,
as specified in the `db_logic.md` file.

The changes include:
- A SQL initialization script (`db/init/init.sql`) to create the
  `USERS_ALMA`, `vanity_hr`, and `vanity_attendance` databases and their
  respective tables.
- SQLAlchemy models for all tables, organized into separate files
  within the `models` directory.
- Refactoring of the database connection logic in `modules/database.py`
  to support connections to all three databases.
- Creation of a `modules/logger.py` to handle request logging to the
  `USERS_ALMA` database.
- Updates to `docker-compose.yml` to mount the initialization script and
  build the bot image locally.
- Updates to `.env.example` to include the new database environment
  variables.
- Restoration of the data dictionary to `db_tasks.md`.

docker-compose.yml

@@ -2,7 +2,7 @@ version: "3.8"
 
 services:
   bot:
-    image: marcogll/vanessa-bot:1.2
+    build: .
     container_name: vanessa_bot
     restart: always
     env_file:
@@ -11,7 +11,6 @@ services:
       - MYSQL_HOST=db
       - MYSQL_USER=${MYSQL_USER}
       - MYSQL_PASSWORD=${MYSQL_PASSWORD}
-      - MYSQL_DATABASE=${MYSQL_DATABASE}
     depends_on:
       db:
         condition: service_healthy
@@ -23,7 +22,6 @@ services:
     container_name: vanessa_db
     restart: always
     environment:
-      MYSQL_DATABASE: ${MYSQL_DATABASE}
       MYSQL_USER: ${MYSQL_USER}
       MYSQL_PASSWORD: ${MYSQL_PASSWORD}
       MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
@@ -34,6 +32,7 @@ services:
       retries: 6
       start_period: 30s
     volumes:
+      - ./db/init:/docker-entrypoint-initdb.d
       - mysql_data:/var/lib/mysql
     ports:
       - "3306:3306"