79 lines
2.6 KiB
Python
79 lines
2.6 KiB
Python
"""One account per address, however it was typed.
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`users.email` had a plain unique index, so `Alice@example.com` and
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`alice@example.com` were two accounts. Nobody types their address the same way
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twice — a signup gets one form, a password reset gets another, and the second
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finds nothing.
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This normalises what is stored and enforces uniqueness on the normalised form.
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**It refuses rather than failing.** If two accounts already differ only by case,
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creating the index would abort with a constraint violation naming an index and
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nothing else. Instead the collisions are found first and reported by address, so
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the person running it knows exactly what to merge. Nothing is changed in that
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case — the migration is a no-op until the data is fixed.
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Uniqueness stays **global**, not per workspace. That is the existing behaviour
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and a deliberate constraint on multi-workspace customers: one address, one
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account. (The base application scopes it per tenant; this does not, and changing
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that is a product decision rather than a migration.)
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Revision ID: c9e2a4b6d407
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Revises: b8d1f4a6c306
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"""
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from typing import Sequence, Union
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import sqlalchemy as sa
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from alembic import op
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revision: str = "c9e2a4b6d407"
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down_revision: Union[str, Sequence[str], None] = "b8d1f4a6c306"
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branch_labels: Union[str, Sequence[str], None] = None
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depends_on: Union[str, Sequence[str], None] = None
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INDEX_NAME = "uq_users_email_lower"
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def upgrade() -> None:
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connection = op.get_bind()
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collisions = connection.execute(
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sa.text(
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"""
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SELECT lower(btrim(email)) AS address,
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count(*) AS n,
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string_agg(email, ', ' ORDER BY email) AS variants
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FROM users
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GROUP BY lower(btrim(email))
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HAVING count(*) > 1
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ORDER BY 1
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"""
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)
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).fetchall()
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if collisions:
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detail = "\n".join(
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f" {row.address}: {row.variants} ({row.n} accounts)" for row in collisions
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)
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raise RuntimeError(
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"Cannot enforce case-insensitive email uniqueness — these addresses "
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"already exist more than once, differing only by case:\n"
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f"{detail}\n"
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"Merge or remove the duplicates, then run this migration again. "
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"Nothing has been changed."
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)
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connection.execute(
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sa.text(
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"UPDATE users SET email = lower(btrim(email)) "
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"WHERE email <> lower(btrim(email))"
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)
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)
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op.create_index(INDEX_NAME, "users", [sa.text("lower(email)")], unique=True)
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def downgrade() -> None:
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op.drop_index(INDEX_NAME, table_name="users")
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