chore: introduce alembic

backend/alembic/README

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+Generic single-database configuration.

backend/alembic/env.py

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+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+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.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+from app.core.database import Base
+from app.models import newsletters, entries, settings # noqa
+
+target_metadata = Base.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() -> None:
+    """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=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection, target_metadata=target_metadata
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

backend/alembic/script.py.mako

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+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, Sequence[str], None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    ${downgrades if downgrades else "pass"}

backend/alembic/versions/fb190ac6937f_initial_migration.py

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+"""Initial migration
+
+Revision ID: fb190ac6937f
+Revises: 
+Create Date: 2025-07-17 15:33:43.435587
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'fb190ac6937f'
+down_revision: Union[str, Sequence[str], None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('newsletters',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('name', sa.String(), nullable=True),
+    sa.Column('move_to_folder', sa.String(), nullable=True),
+    sa.Column('is_active', sa.Boolean(), nullable=True),
+    sa.Column('extract_content', sa.Boolean(), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_newsletters_id'), 'newsletters', ['id'], unique=False)
+    op.create_table('settings',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('imap_server', sa.String(), nullable=True),
+    sa.Column('imap_username', sa.String(), nullable=True),
+    sa.Column('imap_password', sa.String(), nullable=True),
+    sa.Column('search_folder', sa.String(), nullable=True),
+    sa.Column('move_to_folder', sa.String(), nullable=True),
+    sa.Column('mark_as_read', sa.Boolean(), nullable=True),
+    sa.Column('email_check_interval', sa.Integer(), nullable=True),
+    sa.Column('auto_add_new_senders', sa.Boolean(), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_settings_id'), 'settings', ['id'], unique=False)
+    op.create_index(op.f('ix_settings_imap_server'), 'settings', ['imap_server'], unique=False)
+    op.create_table('entries',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('newsletter_id', sa.String(), nullable=True),
+    sa.Column('subject', sa.String(), nullable=True),
+    sa.Column('body', sa.Text(), nullable=True),
+    sa.Column('received_at', sa.DateTime(timezone=True), nullable=True),
+    sa.Column('message_id', sa.String(), nullable=False),
+    sa.ForeignKeyConstraint(['newsletter_id'], ['newsletters.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_entries_id'), 'entries', ['id'], unique=False)
+    op.create_index(op.f('ix_entries_message_id'), 'entries', ['message_id'], unique=True)
+    op.create_table('senders',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('email', sa.String(), nullable=False),
+    sa.Column('newsletter_id', sa.String(), nullable=False),
+    sa.ForeignKeyConstraint(['newsletter_id'], ['newsletters.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_senders_email'), 'senders', ['email'], unique=True)
+    op.create_index(op.f('ix_senders_id'), 'senders', ['id'], unique=False)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_senders_id'), table_name='senders')
+    op.drop_index(op.f('ix_senders_email'), table_name='senders')
+    op.drop_table('senders')
+    op.drop_index(op.f('ix_entries_message_id'), table_name='entries')
+    op.drop_index(op.f('ix_entries_id'), table_name='entries')
+    op.drop_table('entries')
+    op.drop_index(op.f('ix_settings_imap_server'), table_name='settings')
+    op.drop_index(op.f('ix_settings_id'), table_name='settings')
+    op.drop_table('settings')
+    op.drop_index(op.f('ix_newsletters_id'), table_name='newsletters')
+    op.drop_table('newsletters')
+    # ### end Alembic commands ###