adding deps and realizing the file structure

flaskr/__init__.py

@@ -1,5 +1,9 @@
 import os
+import click
 from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+
+
 
 app = Flask(__name__)
 
@@ -22,4 +26,8 @@ def create_app(test_config=None):
     try:
         os.makedirs(app.instance_path)
     except OSError:
-        pass
+        pass
+
+    from . import db
+    db.init_app()
+    click.echo("Initialized the Database.")

flaskr/config.py

@@ -1 +1,3 @@
-import os
+import os
+
+SQLALCHEMY_DATABASE_URI=os.getenv('SQLALCHEMY_DATABASE_URI')

flaskr/db.py

@@ -0,0 +1,6 @@
+import click
+import psycopg2
+from flask_sqlalchemy import SQLAlchemy
+from flask import current_app, g
+from flask.cli import with_appcontext
+

flaskr/model.py

@@ -0,0 +1,2 @@
+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy

requirements.txt

@@ -184,6 +184,8 @@ Mako==1.1.5
 Markdown==3.3.4
 Markups==3.1.2
 MarkupSafe==1.1.1
+marshmallow==3.14.0
+marshmallow-sqlalchemy==0.26.1
 matplotlib==3.4.3
 matplotlib-inline==0.1.2
 mccabe==0.6.1