add database migration tooling with alembic

alembic/README

@@ -0,0 +1 @@
+Generic single-database configuration.

alembic/env.py

@@ -0,0 +1,80 @@
+from logging.config import fileConfig
+from pathlib import Path
+
+import dotenv
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+from wce_crm import constants, db
+
+# 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 myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+target_metadata = db.MD_MAIN
+
+# 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.
+config.set_main_option("sqlalchemy.url", f"sqlite:///{constants.Config.DB_PATH_MAIN}")
+
+
+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()

alembic/script.py.mako

@@ -0,0 +1,28 @@
+"""${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"}

alembic/versions/5f2af5179c47_added_new_column_and_renamed_table_for_.py

@@ -0,0 +1,91 @@
+"""added new column and renamed table for initial recording
+
+Revision ID: 5f2af5179c47
+Revises:
+Create Date: 2026-06-17 16:06:46.421562
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "5f2af5179c47"
+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.rename_table("grunderfassung_unternehmen", "grunderfassung")
+    op.add_column(
+        "grunderfassung",
+        sa.Column("Metadaten_wiedereintrittsdatum", sa.Date, nullable=True, default=None),
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        "grunderfassung_unternehmen",
+        sa.Column("erfassung_id", sa.INTEGER(), nullable=False),
+        sa.Column("Metadaten_erstellung", sa.DATETIME(), nullable=True),
+        sa.Column("Metadaten_aktualisierung", sa.DATETIME(), nullable=True),
+        sa.Column("Metadaten_nutzer", sa.VARCHAR(length=20), nullable=True),
+        sa.Column("Arbeitserfahrung", sa.TEXT(), nullable=True),
+        sa.Column("Grunderfassung_fallnummer", sa.TEXT(), nullable=True),
+        sa.Column("Grunderfassung_notiz", sa.TEXT(), nullable=True),
+        sa.Column("HoehereBildung", sa.TEXT(), nullable=True),
+        sa.Column("Kontaktperson__KP_adresse", sa.TEXT(), nullable=True),
+        sa.Column("Kontaktperson__KP_anrede_anschrift", sa.TEXT(), nullable=True),
+        sa.Column("Kontaktperson__KP_email", sa.TEXT(), nullable=True),
+        sa.Column("Kontaktperson__KP_festnetznummer", sa.TEXT(), nullable=True),
+        sa.Column("Kontaktperson__KP_funktion_beziehung", sa.TEXT(), nullable=True),
+        sa.Column("Kontaktperson__KP_mobilfunknummer", sa.TEXT(), nullable=True),
+        sa.Column("Kontaktperson__KP_name", sa.TEXT(), nullable=True),
+        sa.Column("Kontaktperson__KP_name_partner", sa.TEXT(), nullable=True),
+        sa.Column("Kontaktperson__KP_titel", sa.TEXT(), nullable=True),
+        sa.Column("Kontaktperson__KP_vorname", sa.TEXT(), nullable=True),
+        sa.Column("Partnersuche__kanal_aufmerksamkeit", sa.TEXT(), nullable=True),
+        sa.Column("Partnersuche__person_suche", sa.INTEGER(), nullable=True),
+        sa.Column("Partnersuche__un_suche", sa.INTEGER(), nullable=True),
+        sa.Column("Projektrelevanz__relevanz", sa.TEXT(), nullable=True),
+        sa.Column("Projektrelevanz__foerderperiode", sa.TEXT(), nullable=True),
+        sa.Column("Schulbildung", sa.TEXT(), nullable=True),
+        sa.Column("Sprachkenntnisse", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__PLZ", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__anrede_anschrift", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__anzahl_kinder__alter", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__anzahl_kinder__anzahl", sa.INTEGER(), nullable=True),
+        sa.Column("Stammdaten__aufenthaltsort", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__bundesland", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__land", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__email", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__familienstand", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__festnetznummer", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__geburtsdatum", sa.DATE(), nullable=True),
+        sa.Column("Stammdaten__hausnummer", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__herkunftsland", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__mobilfunknummer", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__name", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__ort", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__rueckkehrer", sa.BOOLEAN(), nullable=True),
+        sa.Column("Stammdaten__staatsangehoerigkeit", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__strasse", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__titel", sa.TEXT(), nullable=True),
+        sa.Column("Stammdaten__vorname", sa.TEXT(), nullable=True),
+        sa.Column("WeitereInfos__WI_arbeitsstatus", sa.TEXT(), nullable=True),
+        sa.Column("WeitereInfos__WI_aufenthaltstitel", sa.TEXT(), nullable=True),
+        sa.Column("WeitereInfos__WI_deutsch_sprache", sa.TEXT(), nullable=True),
+        sa.Column("WeitereInfos__WI_gueltigkeit_aufenthaltstitel", sa.DATE(), nullable=True),
+        sa.Column("WeitereInfos__WI_meldung_institution", sa.TEXT(), nullable=True),
+        sa.PrimaryKeyConstraint("erfassung_id"),
+    )
+    op.drop_table("grunderfassung")
+    # ### end Alembic commands ###