diff --git a/embed-migrations.ts b/embed-migrations.ts
index cda7516..2d2cc2c 100644
--- a/embed-migrations.ts
+++ b/embed-migrations.ts
@@ -7,9 +7,9 @@ const OUTPUT = './src/server/db/migrations.gen.ts'
 const SQL_RELATIVE_FROM_OUTPUT = '../../../drizzle'
 
 const journalEntrySchema = z.object({
-  idx: z.number(),
-  tag: z.string(),
-  when: z.number(),
+  idx: z.number().int().nonnegative(),
+  tag: z.string().regex(/^\d{4}_[a-z0-9_]+$/),
+  when: z.number().int().nonnegative(),
   breakpoints: z.boolean(),
 })
 const journalSchema = z.object({ entries: z.array(journalEntrySchema).default([]) })