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alembic: make migration chain SQLite-compatible (fresh upgrade)

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Five existing migrations used op.alter_column / op.create_unique_constraint /
op.drop_constraint / op.create_foreign_key directly on the users + quotes +
quotes_daily tables. SQLite has no native support for those operations and
requires Alembic's batch_alter_table copy-and-rename workaround.

This wasn't noticed until now because the test suite uses
Base.metadata.create_all to materialise schema, not the migration chain
itself; and prod is MariaDB. But running `alembic upgrade head` against
a fresh SQLite database (developer onboarding, CI smoke tests, the
test container's own bootstrap) would fail at 0005.

Fixes:
- alembic/env.py: set render_as_batch=True when the dialect is SQLite.
  This auto-wraps any future autogenerated migration but doesn't
  retroactively rewrite existing op.* calls.
- 0005 (widen quotes.symbol), 0013 (referrals), 0018 (polar webhook),
  0019 (stripe), 0023 (users.lang index + qd_symbol widen) explicitly
  wrap their problematic ops in `with op.batch_alter_table(...) as bop`.

Now `alembic upgrade head` + `alembic downgrade base` round-trip cleanly
on a fresh SQLite database. MariaDB prod behaviour unchanged.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Giorgio Gilestro 2026-05-28 00:16:09 +02:00
parent 2b9cd875b4
commit 78ce8c8b0d
6 changed files with 79 additions and 74 deletions
Download patch file Download diff file Expand all files Collapse all files

7
alembic/env.py
View file

@ -44,10 +44,17 @@ def run_migrations_offline() -> None:
def do_run_migrations(connection: Connection) -> None: def do_run_migrations(connection: Connection) -> None:
# render_as_batch is required for SQLite, which doesn't support
# most ALTER COLUMN / ADD CONSTRAINT operations natively. With
# batch mode enabled, Alembic emits a copy-and-rename dance under
# SQLite while still producing plain ALTER on MariaDB / Postgres,
# so prod migrations are unchanged. Detect via the dialect name.
render_as_batch = connection.dialect.name == "sqlite"
context.configure( context.configure(
connection=connection, connection=connection,
target_metadata=target_metadata, target_metadata=target_metadata,
compare_type=True, compare_type=True,
render_as_batch=render_as_batch,
) )
with context.begin_transaction(): with context.begin_transaction():
context.run_migrations() context.run_migrations()

31
alembic/versions/0005_widen_quote_symbol.py
View file

@ -17,18 +17,25 @@ depends_on: Union[str, Sequence[str], None] = None
def upgrade() -> None: def upgrade() -> None:
op.alter_column( # batch_alter_table wraps the ALTER in a copy-and-rename dance for
"quotes", "symbol", # SQLite (which doesn't support ALTER COLUMN TYPE) while remaining a
existing_type=sa.String(64), # plain ALTER on MariaDB / Postgres. Required for `alembic upgrade
type_=sa.String(128), # head` to work against a fresh SQLite database during local tooling
existing_nullable=False, # or test bootstrap.
) with op.batch_alter_table("quotes") as bop:
bop.alter_column(
"symbol",
existing_type=sa.String(64),
type_=sa.String(128),
existing_nullable=False,
)
def downgrade() -> None: def downgrade() -> None:
op.alter_column( with op.batch_alter_table("quotes") as bop:
"quotes", "symbol", bop.alter_column(
existing_type=sa.String(128), "symbol",
type_=sa.String(64), existing_type=sa.String(128),
existing_nullable=False, type_=sa.String(64),
) existing_nullable=False,
)

41
alembic/versions/0013_referrals.py
View file

@ -30,23 +30,21 @@ depends_on: Union[str, Sequence[str], None] = None
def upgrade() -> None: def upgrade() -> None:
op.add_column( # batch_alter_table wraps ADD CONSTRAINT in a copy-and-rename for
"users", # SQLite (no native ALTER constraints support); on MariaDB/Postgres
sa.Column("referral_code", sa.String(16), nullable=True), # it falls through to plain ALTER statements.
) with op.batch_alter_table("users") as bop:
op.create_unique_constraint( bop.add_column(sa.Column("referral_code", sa.String(16), nullable=True))
"uq_users_referral_code", "users", ["referral_code"], bop.create_unique_constraint(
) "uq_users_referral_code", ["referral_code"],
op.add_column( )
"users", bop.add_column(sa.Column("referred_by_user_id", sa.Integer, nullable=True))
sa.Column("referred_by_user_id", sa.Integer, nullable=True), bop.create_foreign_key(
) "fk_users_referred_by",
op.create_foreign_key( "users",
"fk_users_referred_by", ["referred_by_user_id"], ["id"],
"users", "users", ondelete="SET NULL",
["referred_by_user_id"], ["id"], )
ondelete="SET NULL",
)
op.create_table( op.create_table(
"referrals", "referrals",
@ -71,7 +69,8 @@ def upgrade() -> None:
def downgrade() -> None: def downgrade() -> None:
op.drop_index("ix_referrals_referrer", table_name="referrals") op.drop_index("ix_referrals_referrer", table_name="referrals")
op.drop_table("referrals") op.drop_table("referrals")
op.drop_constraint("fk_users_referred_by", "users", type_="foreignkey") with op.batch_alter_table("users") as bop:
op.drop_column("users", "referred_by_user_id") bop.drop_constraint("fk_users_referred_by", type_="foreignkey")
op.drop_constraint("uq_users_referral_code", "users", type_="unique") bop.drop_column("referred_by_user_id")
op.drop_column("users", "referral_code") bop.drop_constraint("uq_users_referral_code", type_="unique")
bop.drop_column("referral_code")

22
alembic/versions/0018_polar_webhook.py
View file

@ -17,17 +17,12 @@ depends_on: Union[str, Sequence[str], None] = None
def upgrade() -> None: def upgrade() -> None:
op.add_column( with op.batch_alter_table("users") as bop:
"users", bop.add_column(sa.Column("polar_customer_id", sa.String(length=64), nullable=True))
sa.Column("polar_customer_id", sa.String(length=64), nullable=True), bop.add_column(sa.Column("polar_subscription_id", sa.String(length=64), nullable=True))
) bop.create_unique_constraint(
op.add_column( "uq_users_polar_customer", ["polar_customer_id"],
"users", )
sa.Column("polar_subscription_id", sa.String(length=64), nullable=True),
)
op.create_unique_constraint(
"uq_users_polar_customer", "users", ["polar_customer_id"],
)
op.create_table( op.create_table(
"polar_events", "polar_events",
@ -50,6 +45,7 @@ def upgrade() -> None:
def downgrade() -> None: def downgrade() -> None:
op.drop_index("ix_polar_events_type_received", table_name="polar_events") op.drop_index("ix_polar_events_type_received", table_name="polar_events")
op.drop_table("polar_events") op.drop_table("polar_events")
op.drop_constraint("uq_users_polar_customer", "users", type_="unique") with op.batch_alter_table("users") as bop:
op.drop_column("users", "polar_subscription_id") bop.drop_constraint("uq_users_polar_customer", type_="unique")
bop.drop_column("polar_subscription_id")
op.drop_column("users", "polar_customer_id") op.drop_column("users", "polar_customer_id")

24
alembic/versions/0019_stripe.py
View file

@ -18,17 +18,12 @@ depends_on: Union[str, Sequence[str], None] = None
def upgrade() -> None: def upgrade() -> None:
op.add_column( with op.batch_alter_table("users") as bop:
"users", bop.add_column(sa.Column("stripe_customer_id", sa.String(length=64), nullable=True))
sa.Column("stripe_customer_id", sa.String(length=64), nullable=True), bop.add_column(sa.Column("stripe_subscription_id", sa.String(length=64), nullable=True))
) bop.create_unique_constraint(
op.add_column( "uq_users_stripe_customer", ["stripe_customer_id"],
"users", )
sa.Column("stripe_subscription_id", sa.String(length=64), nullable=True),
)
op.create_unique_constraint(
"uq_users_stripe_customer", "users", ["stripe_customer_id"],
)
op.create_table( op.create_table(
"stripe_events", "stripe_events",
@ -51,6 +46,7 @@ def upgrade() -> None:
def downgrade() -> None: def downgrade() -> None:
op.drop_index("ix_stripe_events_type_received", table_name="stripe_events") op.drop_index("ix_stripe_events_type_received", table_name="stripe_events")
op.drop_table("stripe_events") op.drop_table("stripe_events")
op.drop_constraint("uq_users_stripe_customer", "users", type_="unique") with op.batch_alter_table("users") as bop:
op.drop_column("users", "stripe_subscription_id") bop.drop_constraint("uq_users_stripe_customer", type_="unique")
op.drop_column("users", "stripe_customer_id") bop.drop_column("stripe_subscription_id")
bop.drop_column("stripe_customer_id")

28
alembic/versions/0023_lang_index_and_qd_symbol_widen.py
View file

@ -18,21 +18,21 @@ depends_on: Union[str, Sequence[str], None] = None
def upgrade() -> None: def upgrade() -> None:
op.create_index("ix_users_lang", "users", ["lang"]) op.create_index("ix_users_lang", "users", ["lang"])
op.alter_column( with op.batch_alter_table("quotes_daily") as bop:
"quotes_daily", bop.alter_column(
"symbol", "symbol",
existing_type=sa.String(length=64), existing_type=sa.String(length=64),
type_=sa.String(length=128), type_=sa.String(length=128),
existing_nullable=False, existing_nullable=False,
) )
def downgrade() -> None: def downgrade() -> None:
op.alter_column( with op.batch_alter_table("quotes_daily") as bop:
"quotes_daily", bop.alter_column(
"symbol", "symbol",
existing_type=sa.String(length=128), existing_type=sa.String(length=128),
type_=sa.String(length=64), type_=sa.String(length=64),
existing_nullable=False, existing_nullable=False,
) )
op.drop_index("ix_users_lang", table_name="users") op.drop_index("ix_users_lang", table_name="users")