Improved database module structure

src/tests_dev/appsettings.development.json

@@ -4,5 +4,10 @@
     "Filename": "log_$start_time.log",
     "ConsoleLogLevel": "TRACE",
     "FileLogLevel": "TRACE"
+  },
+  "DatabaseSettings": {
+    "ConnectionString": "mysql+mysqlconnector://sh_cpl:$credentials@localhost/sh_cpl",
+    "Credentials": "MHZhc0Y2bjhKc1VUMWV0Qw==",
+    "Encoding": "utf8mb4"
   }
 }