name the over-long foreign keys so db:push can be a no-op

Drizzle generates names past Postgres's 63-character identifier limit. Postgres
stores the truncated form, drizzle compares against its own longer one, and every
push on every host drops and re-adds constraints that are already identical.

Deferred as harmless noise since 2026-08-19. What ended that was a deploy plan
saying "expect no changes, stop if it wants to alter something" — which this made
impossible to satisfy, so the deploy agent had to overrule its own instructions.

Verified by pushing twice against a scratch database: the fleet-wide second-push
churn went from ten statements to two, and the two that remain are a composite
primary key that cannot be fixed either way.

Naming a foreign key means removing the inline .references() or drizzle creates
both.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

sidecar/db/collections/schema.ts

@@ -1,4 +1,4 @@
-import { pgTable, uuid, text, timestamp, index, primaryKey } from 'drizzle-orm/pg-core';
+import { pgTable, uuid, text, timestamp, index, primaryKey, foreignKey} from 'drizzle-orm/pg-core';
 import { generations } from '../generations/schema';
 
 /**
@@ -29,15 +29,30 @@ export const collections = pgTable('atelier_collections', {
  */
 export const collectionItems = pgTable('atelier_collection_items',
   {
-    collectionId: uuid('collection_id')
-      .notNull()
-      .references(() => collections.id, { onDelete: 'cascade' }),
-    generationId: uuid('generation_id')
-      .notNull()
-      .references(() => generations.id, { onDelete: 'cascade' }),
+    collectionId: uuid('collection_id').notNull(),
+    generationId: uuid('generation_id').notNull(),
     addedAt: timestamp('added_at', { withTimezone: true }).notNull().defaultNow(),
   },
   (table) => [
+    /*
+      Both foreign keys are NAMED, because drizzle generates names over Postgres's 63-character identifier
+      limit — 65 and 64. Postgres stores the truncated form, drizzle keeps comparing against its own longer
+      one, and every `db:push` drops and re-adds constraints that are already identical. Four statements per
+      push, on every host, for ever.
+
+      It read as harmless noise until a deploy plan said "expect no changes" and this made that impossible
+      to satisfy on all five hosts, forcing the deploy agent to overrule its own instructions.
+    */
+    foreignKey({
+      name: 'fk_atelier_collection_items_collection',
+      columns: [table.collectionId],
+      foreignColumns: [collections.id],
+    }).onDelete('cascade'),
+    foreignKey({
+      name: 'fk_atelier_collection_items_generation',
+      columns: [table.generationId],
+      foreignColumns: [generations.id],
+    }).onDelete('cascade'),
     // The composite key is what makes adding an image twice a no-op instead of a duplicate.
     primaryKey({ columns: [table.collectionId, table.generationId] }),
     index('atelier_collection_items_generation_idx').on(table.generationId),