Function pluralize 

pub fn pluralize(value: &str) -> String

English pluralization used for both REST route segments and generated table/column names — the single implementation cratestack-core and cratestack-migrate both call (cratestack#504; previously two hand-synced copies, cratestack-migrate::naming::pluralize mirroring this one, that had already drifted apart on this exact rule).

Rules, in order: a value ending in s gets es appended (bus -> buses); a value ending in a consonant + y swaps the y for ies (category -> categories, webhook_delivery -> webhook_deliveries); a value ending in a vowel + y (day) or anything else just gets a bare s appended (day -> days).

Still not a grammatically complete English pluralizer — irregular plurals (person -> people) are not handled, and there is deliberately no way to override the result for a given model today. @@map(...) is the planned escape hatch for that (flagged as a known gap by cratestack#504, not yet implemented, out of scope here). This function only needs to match the server’s route registration and the migration engine’s table naming, not be linguistically ideal.

Migrating past cratestack#504’s y -> ies fix. This function feeds cratestack-migrate’s table-name derivation (cratestack_migrate::naming::table_name), and cratestack-migrate’s diff engine matches tables by name only — it never infers a rename from two schemas that otherwise look related (crates/cratestack-migrate/src/diff.rs). Any deployed model whose name ends in a consonant + y (Category, Delivery, Entry, Query, …) changes its derived table name on this upgrade (categorys -> categories). Running cratestack migrate diff against such a schema without first declaring the rename produces DropTable(categorys) + CreateTable(categories) — applying that migration destroys the table’s data.

Before running migrate diff after upgrading past this change, add @@rename(from = "<old_table_name>") to every affected model (e.g. @@rename(from = "categorys") on model Category) so the diff engine emits ALTER TABLE ... RENAME TO ... instead. See crates/cratestack-migrate/src/convert/renames.rs for the attribute and crates/cratestack-migrate/src/emit/postgres/tests/renames.rs’s pluralization_change_with_rename_marker_is_a_rename_not_drop_and_create test for a worked example of exactly this scenario (and its sibling ..._without_rename_marker_drops_and_recreates, which pins down what happens if you skip this step).