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42 lines
1.1 KiB
Python
42 lines
1.1 KiB
Python
"""Anonymize fall_ids: replace Nachname with KVNR or random suffix.
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Revision ID: 006_anonymize_fall_ids
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Revises: 005_disclosure
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"""
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import random
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import string
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from alembic import op
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import sqlalchemy as sa
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revision = "006_anonymize_fall_ids"
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down_revision = "005_disclosure"
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branch_labels = None
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depends_on = None
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def _random_suffix(length=6):
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charset = string.ascii_uppercase + string.digits
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return "".join(random.choices(charset, k=length))
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def upgrade():
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conn = op.get_bind()
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cases = conn.execute(
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sa.text("SELECT id, fall_id, kvnr, jahr, kw, fallgruppe FROM cases")
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).fetchall()
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for case in cases:
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case_id, old_fall_id, kvnr, jahr, kw, fallgruppe = case
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suffix = kvnr if kvnr else _random_suffix()
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new_fall_id = f"{jahr}-{kw:02d}-{fallgruppe}-{suffix}"
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conn.execute(
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sa.text("UPDATE cases SET fall_id = :new_id WHERE id = :case_id"),
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{"new_id": new_fall_id, "case_id": case_id},
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)
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def downgrade():
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# Cannot restore original Nachname-based fall_ids — data is lost
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pass
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