refactor: migrate connection and db modules

.env

@@ -1,31 +1,39 @@
-DB=pg
-DB_NAME=lucid
+LEGACY_MYSQL_HOST=localhost
+LEGACY_MYSQL_PASSWORD=secret
+LEGACY_MYSQL_DATABASE=lucid
+LEGACY_MYSQL_PORT=3306
+LEGACY_MYSQL_USER=virk
+
+LEGACY_MYSQL_READ_REPLICA_HOST=localhost
+LEGACY_MYSQL_READ_REPLICA_PASSWORD=secret
+LEGACY_MYSQL_READ_REPLICA_DATABASE=lucid
+LEGACY_MYSQL_READ_REPLICA_PORT=3307
+LEGACY_MYSQL_READ_REPLICA_USER=virk
 
 MYSQL_HOST=localhost
-MYSQL_PORT=3306
+MYSQL_PASSWORD=secret
+MYSQL_DATABASE=lucid
+MYSQL_PORT=3308
 MYSQL_USER=virk
-MYSQL_PASSWORD=password
-
-MYSQL_LEGACY_HOST=localhost
-MYSQL_LEGACY_PORT=3306
-MYSQL_LEGACY_USER=virk
-MYSQL_LEGACY_PASSWORD=password
-
-MYSQL_REPLICA_1_HOST=localhost
-MYSQL_REPLICA_1_PORT=3306
-MYSQL_REPLICA_1_USER=virk
-MYSQL_REPLICA_1_PASSWORD=password
-
-MYSQL_REPLICA_2_HOST=localhost
-MYSQL_REPLICA_2_PORT=3306
-MYSQL_REPLICA_2_USER=virk
-MYSQL_REPLICA_2_PASSWORD=password
 
 PG_HOST=localhost
+PG_PASSWORD=secret
+PG_DATABASE=lucid
 PG_PORT=5432
 PG_USER=virk
-PG_PASSWORD=password
 
-MSSQL_SERVER=localhost
+PG_READ_REPLICA_HOST=localhost
+PG_READ_REPLICA_PASSWORD=secret
+PG_READ_REPLICA_DATABASE=lucid
+PG_READ_REPLICA_PORT=5433
+PG_READ_REPLICA_USER=virk
+
+MSSQL_HOST=localhost
+MSSQL_PASSWORD=secrearandom&233passwordt
+MSSQL_PORT=1433
 MSSQL_USER=sa
-MSSQL_PASSWORD=arandom&233password
+
+MSSQL_READ_REPLICA_HOST=localhost
+MSSQL_READ_REPLICA_PASSWORD=secrearandom&233passwordt
+MSSQL_READ_REPLICA_PORT=1434
+MSSQL_READ_REPLICA_USER=sa