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db: remove redundant unique constraints from primary keys
Primary keys are always unique, both in the SQL standard and in SQLite,
MySQL and PostgreSQL.
Setting unique=True cases SQLAlchemy to explicitly add additional,
redundant UNIQUE indexes to the columns, which is at best needless
metadata overhead, and at worst causes the database engine to waste
time maintaining an extra index that serves no purpose.
Primary keys are always unique, both in the SQL standard and in SQLite,
MySQL and PostgreSQL.
Setting unique=True cases SQLAlchemy to explicitly add additional,
redundant UNIQUE indexes to the columns, which is at best needless
metadata overhead, and at worst causes the database engine to waste
time maintaining an extra index that serves no purpose.