implemented a lot of features

database/migrations/1768620764910_readable_name_any_extension.ts

@@ -0,0 +1,23 @@
+import { BaseSchema } from '@adonisjs/lucid/schema'
+
+/**
+ * is_readable_name(): also judge the stem without an unknown short
+ * extension, so `326678d1d07ef12a.bin` counts as random (CONCEPT.md D22).
+ */
+export default class extends BaseSchema {
+  async up() {
+    this.defer(async (db) => {
+      await db.rawQuery(`
+        CREATE OR REPLACE FUNCTION is_readable_name(name text) RETURNS boolean IMMUTABLE LANGUAGE sql AS $$
+          WITH s AS (SELECT regexp_replace(name_stem(name), '\\.[A-Za-z0-9]{1,4}$', '') AS stem)
+          SELECT name IS NOT NULL AND NOT (
+            (stem ~ '^[A-Za-z0-9]{16,}$' AND stem ~ '[a-z]' AND stem ~ '[A-Z]'
+              AND (stem ~ '\\d' OR length(regexp_replace(stem, '[^A-Z]', '', 'g')) >= 6))
+            OR stem ~* '^[0-9a-f]{16,}$')
+          FROM s
+        $$`)
+    })
+  }
+
+  async down() {}
+}