init: first migrations

migrations/README

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+Single-database configuration for Flask.

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,flask_migrate
+
+[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
+
+[logger_flask_migrate]
+level = INFO
+handlers =
+qualname = flask_migrate
+
+[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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+import logging
+from logging.config import fileConfig
+
+from flask import current_app
+
+from alembic import context
+
+# 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')
+
+
+def get_engine():
+    try:
+        # this works with Flask-SQLAlchemy<3 and Alchemical
+        return current_app.extensions['migrate'].db.get_engine()
+    except (TypeError, AttributeError):
+        # this works with Flask-SQLAlchemy>=3
+        return current_app.extensions['migrate'].db.engine
+
+
+def get_engine_url():
+    try:
+        return get_engine().url.render_as_string(hide_password=False).replace(
+            '%', '%%')
+    except AttributeError:
+        return str(get_engine().url).replace('%', '%%')
+
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+config.set_main_option('sqlalchemy.url', get_engine_url())
+target_db = current_app.extensions['migrate'].db
+
+# 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 get_metadata():
+    if hasattr(target_db, 'metadatas'):
+        return target_db.metadatas[None]
+    return target_db.metadata
+
+
+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, target_metadata=get_metadata(), literal_binds=True
+    )
+
+    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.')
+
+    conf_args = current_app.extensions['migrate'].configure_args
+    if conf_args.get("process_revision_directives") is None:
+        conf_args["process_revision_directives"] = process_revision_directives
+
+    connectable = get_engine()
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=get_metadata(),
+            **conf_args
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+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/0e07095d2961_initial_migration.py

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+"""Initial migration
+
+Revision ID: 0e07095d2961
+Revises: 
+Create Date: 2025-08-29 01:28:57.822103
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = '0e07095d2961'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('admins')
+    with op.batch_alter_table('subscribers', schema=None) as batch_op:
+        batch_op.drop_index(batch_op.f('idx_subscribers_created_at'))
+        batch_op.drop_index(batch_op.f('idx_subscribers_email'))
+        batch_op.drop_index(batch_op.f('idx_subscribers_status'))
+
+    op.drop_table('subscribers')
+    op.drop_table('admin_users')
+    op.drop_table('email_deliveries')
+    with op.batch_alter_table('newsletters', schema=None) as batch_op:
+        batch_op.drop_index(batch_op.f('idx_newsletters_sent_at'))
+
+    op.drop_table('newsletters')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('newsletters',
+    sa.Column('id', sa.INTEGER(), server_default=sa.text("nextval('newsletters_id_seq'::regclass)"), autoincrement=True, nullable=False),
+    sa.Column('subject', sa.TEXT(), autoincrement=False, nullable=False),
+    sa.Column('body', sa.TEXT(), autoincrement=False, nullable=False),
+    sa.Column('sent_at', postgresql.TIMESTAMP(), server_default=sa.text('CURRENT_TIMESTAMP'), autoincrement=False, nullable=True),
+    sa.Column('sent_by', sa.TEXT(), autoincrement=False, nullable=True),
+    sa.Column('recipient_count', sa.INTEGER(), server_default=sa.text('0'), autoincrement=False, nullable=True),
+    sa.Column('success_count', sa.INTEGER(), server_default=sa.text('0'), autoincrement=False, nullable=True),
+    sa.Column('failure_count', sa.INTEGER(), server_default=sa.text('0'), autoincrement=False, nullable=True),
+    sa.PrimaryKeyConstraint('id', name='newsletters_pkey'),
+    postgresql_ignore_search_path=False
+    )
+    with op.batch_alter_table('newsletters', schema=None) as batch_op:
+        batch_op.create_index(batch_op.f('idx_newsletters_sent_at'), [sa.literal_column('sent_at DESC')], unique=False)
+
+    op.create_table('email_deliveries',
+    sa.Column('id', sa.INTEGER(), autoincrement=True, nullable=False),
+    sa.Column('newsletter_id', sa.INTEGER(), autoincrement=False, nullable=True),
+    sa.Column('email', sa.TEXT(), autoincrement=False, nullable=False),
+    sa.Column('status', sa.TEXT(), autoincrement=False, nullable=True),
+    sa.Column('sent_at', postgresql.TIMESTAMP(timezone=True), server_default=sa.text('CURRENT_TIMESTAMP'), autoincrement=False, nullable=True),
+    sa.Column('error_message', sa.TEXT(), autoincrement=False, nullable=True),
+    sa.CheckConstraint("status = ANY (ARRAY['sent'::text, 'failed'::text, 'bounced'::text])", name=op.f('email_deliveries_status_check')),
+    sa.ForeignKeyConstraint(['newsletter_id'], ['newsletters.id'], name=op.f('email_deliveries_newsletter_id_fkey')),
+    sa.PrimaryKeyConstraint('id', name=op.f('email_deliveries_pkey'))
+    )
+    op.create_table('admin_users',
+    sa.Column('id', sa.INTEGER(), autoincrement=True, nullable=False),
+    sa.Column('username', sa.TEXT(), autoincrement=False, nullable=False),
+    sa.Column('password', sa.TEXT(), autoincrement=False, nullable=False),
+    sa.Column('created_at', postgresql.TIMESTAMP(timezone=True), server_default=sa.text('CURRENT_TIMESTAMP'), autoincrement=False, nullable=True),
+    sa.Column('last_login', postgresql.TIMESTAMP(timezone=True), autoincrement=False, nullable=True),
+    sa.Column('is_active', sa.BOOLEAN(), server_default=sa.text('true'), autoincrement=False, nullable=True),
+    sa.PrimaryKeyConstraint('id', name=op.f('admin_users_pkey')),
+    sa.UniqueConstraint('username', name=op.f('admin_users_username_key'), postgresql_include=[], postgresql_nulls_not_distinct=False)
+    )
+    op.create_table('subscribers',
+    sa.Column('id', sa.INTEGER(), autoincrement=True, nullable=False),
+    sa.Column('email', sa.TEXT(), autoincrement=False, nullable=False),
+    sa.Column('created_at', postgresql.TIMESTAMP(timezone=True), server_default=sa.text('CURRENT_TIMESTAMP'), autoincrement=False, nullable=True),
+    sa.Column('subscribed_at', postgresql.TIMESTAMP(timezone=True), server_default=sa.text('CURRENT_TIMESTAMP'), autoincrement=False, nullable=True),
+    sa.Column('status', sa.TEXT(), server_default=sa.text("'active'::text"), autoincrement=False, nullable=True),
+    sa.Column('source', sa.TEXT(), server_default=sa.text("'manual'::text"), autoincrement=False, nullable=True),
+    sa.CheckConstraint("status = ANY (ARRAY['active'::text, 'unsubscribed'::text])", name=op.f('subscribers_status_check')),
+    sa.PrimaryKeyConstraint('id', name=op.f('subscribers_pkey')),
+    sa.UniqueConstraint('email', name=op.f('subscribers_email_key'), postgresql_include=[], postgresql_nulls_not_distinct=False)
+    )
+    with op.batch_alter_table('subscribers', schema=None) as batch_op:
+        batch_op.create_index(batch_op.f('idx_subscribers_status'), ['status'], unique=False)
+        batch_op.create_index(batch_op.f('idx_subscribers_email'), ['email'], unique=False)
+        batch_op.create_index(batch_op.f('idx_subscribers_created_at'), [sa.literal_column('created_at DESC')], unique=False)
+
+    op.create_table('admins',
+    sa.Column('id', sa.INTEGER(), autoincrement=True, nullable=False),
+    sa.Column('username', sa.VARCHAR(length=100), autoincrement=False, nullable=False),
+    sa.Column('password_hash', sa.VARCHAR(length=255), autoincrement=False, nullable=False),
+    sa.Column('created_at', postgresql.TIMESTAMP(), server_default=sa.text('CURRENT_TIMESTAMP'), autoincrement=False, nullable=True),
+    sa.PrimaryKeyConstraint('id', name=op.f('admins_pkey')),
+    sa.UniqueConstraint('username', name=op.f('admins_username_key'), postgresql_include=[], postgresql_nulls_not_distinct=False)
+    )
+    # ### end Alembic commands ###