init

app.py

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+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+from sqlalchemy import MetaData
+from flask_migrate import Migrate
+
+app = Flask(__name__)
+app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql:///forget'
+app.config['SQLALCHEMY_ECHO'] = True
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+
+metadata = MetaData(naming_convention = {
+    "ix": 'ix_%(column_0_label)s',
+    "uq": "uq_%(table_name)s_%(column_0_name)s",
+    "ck": "ck_%(table_name)s_%(constraint_name)s",
+    "fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
+    "pk": "pk_%(table_name)s"
+})
+
+db = SQLAlchemy(app, metadata=metadata)
+migrate = Migrate(app, db)

forget.py

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+from app import app
+import routes

lib.py

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+from model import User
+from flask import request
+from functools import update_wrapper
+
+def require_auth(fun):
+    # TODO actual auth and session checking and such
+    def newfun(*args, **kwargs):
+        fun(User.query.get('8080418'), *args, **kwargs)
+    update_wrapper(newfun, fun)
+    return newfun

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
+import logging
+
+# 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)
+logger = logging.getLogger('alembic.env')
+
+# 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.
+
+    """
+
+    # this callback is used to prevent an auto-migration from being generated
+    # when there are no changes to the schema
+    # reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html
+    def process_revision_directives(context, revision, directives):
+        if getattr(config.cmd_opts, 'autogenerate', False):
+            script = directives[0]
+            if script.upgrade_ops.is_empty():
+                directives[:] = []
+                logger.info('No changes in schema detected.')
+
+    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,
+                      process_revision_directives=process_revision_directives,
+                      **current_app.extensions['migrate'].configure_args)
+
+    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 | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

migrations/versions/253e9e2dae2d_init.py

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+"""init
+
+Revision ID: 253e9e2dae2d
+Revises: 
+Create Date: 2017-07-25 09:50:45.374362
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '253e9e2dae2d'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('users',
+    sa.Column('display_name', sa.String(), nullable=True),
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.PrimaryKeyConstraint('id', name=op.f('pk_users'))
+    )
+    op.create_table('account',
+    sa.Column('user_id', sa.Integer(), nullable=True),
+    sa.Column('remote_id', sa.String(), nullable=False),
+    sa.Column('service', sa.Enum('twitter', name='enum_services'), nullable=False),
+    sa.Column('credentials', sa.JSON(), nullable=True),
+    sa.Column('policy_enabled', sa.Boolean(), nullable=True),
+    sa.Column('policy_keep_younger', sa.Interval(), nullable=True),
+    sa.Column('policy_keep_latest', sa.Integer(), nullable=True),
+    sa.Column('policy_delete_every', sa.Interval(), nullable=True),
+    sa.ForeignKeyConstraint(['user_id'], ['users.id'], name=op.f('fk_account_user_id_users')),
+    sa.PrimaryKeyConstraint('remote_id', 'service', name=op.f('pk_account'))
+    )
+    op.create_table('sessions',
+    sa.Column('user_id', sa.Integer(), nullable=True),
+    sa.Column('token', sa.String(), nullable=False),
+    sa.ForeignKeyConstraint(['user_id'], ['users.id'], name=op.f('fk_sessions_user_id_users')),
+    sa.PrimaryKeyConstraint('token', name=op.f('pk_sessions'))
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('sessions')
+    op.drop_table('account')
+    op.drop_table('users')
+    # ### end Alembic commands ###

model.py

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+import datetime
+
+from app import db
+
+model = db.Model
+
+class User(db.Model):
+    __tablename__ = 'users'
+
+    display_name = db.Column(db.String)
+    id = db.Column(db.Integer, primary_key=True)
+
+class Account(db.Model):
+
+    user = db.relationship(User)
+    user_id = db.Column(db.Integer, db.ForeignKey('users.id'))
+
+    remote_id = db.Column(db.String, primary_key=True)
+    service = db.Column(
+            db.Enum("twitter", name="enum_services")
+            , primary_key=True)
+    credentials = db.Column(db.JSON)
+
+    policy_enabled = db.Column(db.Boolean, default=False)
+    policy_keep_younger = db.Column(db.Interval)
+    policy_keep_latest = db.Column(db.Integer)
+    policy_delete_every = db.Column(db.Interval)
+
+class Session(db.Model):
+    __tablename__ = 'sessions'
+
+    user = db.relationship(User)
+    user_id = db.Column(db.Integer, db.ForeignKey('users.id'))
+
+    token = db.Column(db.String, primary_key=True)
+

requirements.txt

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+alembic==0.9.3
+Flask==0.12.2
+Flask-Migrate==2.0.4
+Flask-SQLAlchemy==2.2
+psycopg2==2.7.1

routes.py

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+from app import app
+from flask import request, Response
+from lib import require_auth
+
+@app.route('/')
+@require_auth
+def index(viewer):
+    return "Hello, %s (%s)" % (viewer.name, viewer.twitter_id)
+