Got upto flask-SQLAlchemy part.

migrations/README

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+Generic single-database configuration.

migrations/alembic.ini

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+# A generic, single database configuration.
+
+[alembic]
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

migrations/env.py

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+from __future__ import with_statement
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+from logging.config import fileConfig
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+from flask import current_app
+config.set_main_option('sqlalchemy.url', current_app.config.get('SQLALCHEMY_DATABASE_URI'))
+target_metadata = current_app.extensions['migrate'].db.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(url=url)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    engine = engine_from_config(
+                config.get_section(config.config_ini_section),
+                prefix='sqlalchemy.',
+                poolclass=pool.NullPool)
+
+    connection = engine.connect()
+    context.configure(
+                connection=connection,
+                target_metadata=target_metadata
+                )
+
+    try:
+        with context.begin_transaction():
+            context.run_migrations()
+    finally:
+        connection.close()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
+

migrations/script.py.mako

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+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision}
+Create Date: ${create_date}
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

migrations/versions/54da866682a_.py

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+"""empty message
+
+Revision ID: 54da866682a
+Revises: None
+Create Date: 2015-02-18 20:11:08.184592
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '54da866682a'
+down_revision = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('todo',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('text', sa.String(length=255), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    ### end Alembic commands ###
+
+
+def downgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('todo')
+    ### end Alembic commands ###

run.py

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+from flask.ext.script import Manager
+from flask.ext.migrate import Migrate, MigrateCommand
+from flask.ext.script.commands import ShowUrls, Clean
+
+from todo import app, db
+
+
+migrate = Migrate(app, db)
+manager = Manager(app)
+manager.add_command('db', MigrateCommand)
+manager.add_command("show-urls", ShowUrls())
+manager.add_command("clean", Clean())
+
+manager.run()

todo/__init__.py

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+from flask import Flask
+from flask.ext.sqlalchemy import SQLAlchemy
+
+
+DATABASE = '/tmp/todo.db'
+DEBUG = True
+SECRET_KEY = 'development-key'
+SQLALCHEMY_DATABASE_URI = "sqlite:///" + DATABASE
+
+app = Flask(__name__)
+app.config.from_object(__name__)
+db = SQLAlchemy(app)
+
+from . import views

todo/models.py

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+from . import db
+
+class Todo(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    text = db.Column(db.String(255), nullable=False)
+
+    def __init__(self, text):
+        self.text = text
+
+    def __repr__(self):
+        return "<Todo {}>".format(self.text)

todo/schema.sql

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+CREATE TABLE todo (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  text VARCHAR(255)
+)

todo/templates/index.html

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+{% extends "layout.html" %}
+
+{% block body %}
+    <h1>Create a new todo</h1>
+    <form action="{{ url_for('make_a_todo') }}" method="post">
+        <input type="text" name="text"/>
+        <input type="submit" value="Create todo"/>
+    </form>
+    <h1>All todos</h1>
+    <form action="{{ url_for('complete_tasks') }}" method="post">
+        <ul>
+            {% for todo in todos %}
+                <li>
+                    <input type="checkbox" name="todo" id="todo-{{ todo.id }}" value="{{ todo.id }}"/>
+                    <label for="todo-{{ todo.id }}">{{ todo.text }}</label>
+                </li>
+            {% endfor %}
+        </ul>
+        <input type="submit" value="Mark checked as done"/>
+    </form>
+{% endblock %}

todo/templates/layout.html

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+<!DOCTYPE html>
+<html>
+<head>
+    <title>Todo List</title>
+</head>
+
+<body>
+{% block body %}{% endblock %}
+</body>
+</html>

todo/todo.py

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+from flask import Flask, render_template, request, redirect, url_for
+from flask.ext.sqlalchemy import SQLAlchemy
+from flask.ext.script import Manager
+from flask.ext.migrate import Migrate, MigrateCommand
+
+DATABASE = '/tmp/todo.db'
+DEBUG = True
+SECRET_KEY = 'development-key'
+SQLALCHEMY_DATABASE_URI = "sqlite:///" + DATABASE
+
+app = Flask(__name__)
+app.config.from_object(__name__)
+
+db = SQLAlchemy(app)
+migrate = Migrate(app, db)
+
+manager = Manager(app)
+manager.add_command('db', MigrateCommand)
+
+
+
+class Todo(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    text = db.Column(db.String(255))
+
+    def __init__(self, text):
+        self.text = text
+
+    def __repr__(self):
+        return "<Todo {}>".format(self.text)
+
+@app.route("/")
+def index():
+    todo_list = Todo.query.all()
+    return render_template("index.html",
+                           todos=todo_list)
+
+
+@app.route("/add", methods=['POST'])
+def make_a_todo():
+    text = request.form['text']
+    todo = Todo(text)
+    db.session.add(todo)
+    db.session.commit()
+    return redirect(url_for('index'))
+
+
+@app.route("/complete_tasks", methods=['POST'])
+def complete_tasks():
+    ids = request.form.getlist('todo')
+    for id in ids:
+        todo = Todo.query.get(id)
+        db.session.delete(todo)
+    db.session.commit()
+    return redirect(url_for('index'))
+
+
+if __name__ == "__main__":
+    manager.run()

todo/views.py

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+from flask import Flask, render_template, request, redirect, url_for
+from .models import Todo
+from . import app, db
+
+@app.route("/")
+def index():
+    todo_list = Todo.query.all()
+    return render_template("index.html",
+                           todos=todo_list)
+
+
+@app.route("/add", methods=['POST'])
+def make_a_todo():
+    text = request.form['text']
+    todo = Todo(text)
+    db.session.add(todo)
+    db.session.commit()
+    return redirect(url_for('index'))
+
+
+@app.route("/complete_tasks", methods=['POST'])
+def complete_tasks():
+    ids = request.form.getlist('todo')
+    for id in ids:
+        todo = Todo.query.get(id)
+        db.session.delete(todo)
+    db.session.commit()
+    return redirect(url_for('index'))
+
+
+if __name__ == "__main__":
+    manager.run()