Delete/Create single table.

deleteme.py

from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite://'  ## Just keep it in memory.
db = SQLAlchemy(app)


class User(db.Model):
    __tablename__ = 'user'
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True)

    def __init__(self, username):
        self.username = username

    def __repr__(self):
        return '<User %r>' % self.username


class Another(db.Model):
    __tablename__ = 'another'
    id = db.Column(db.Integer, primary_key=True)
    field = db.Column(db.String())

    def __init__(self, field):
        self.field = field

    def __repr__(self):
        return '<Another %r>' % self.field

if __name__ == '__main__':
    with app.app_context():
        db.create_all()
        db.session.add(Another(field='Foo'))
        db.session.add(User(username='Bob'))
        db.session.commit()

        print User.query.first()
        # <User u'Bob'>

        print Another.query.first()
        # <Another u'Foo'>

        User.__table__.drop(db.engine)
        User.__table__.create(db.engine)

        print User.query.first()
        # None