update .gitignore to include .vscode and clarify naming convention in app initialization

Author: piyush-jaiswal

.gitignore

@@ -11,8 +11,9 @@ ENV/
 env.bak/
 venv.bak/
 
-# PyCharm
+# Development
 .idea/
+.vscode
 
 # Others
 notes.txt

app/__init__.py

@@ -14,7 +14,8 @@
 app.config['SQLALCHEMY_DATABASE_URI'] = os.getenv("SQLALCHEMY_DATABASE_URI")
 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
 
-# PostgreSQL-compatible naming convention
+# PostgreSQL-compatible naming convention (to follow the naming convention already used in the DB)
+# https://stackoverflow.com/questions/4107915/postgresql-default-constraint-names
 naming_convention = {
     "ix": "%(table_name)s_%(column_0_name)s_idx",       # Indexes
     "uq": "%(table_name)s_%(column_0_name)s_key",       # Unique constraints