Import source: app/backend/prisma/migrations/00000000000002_persian_fts/migration.sql

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

app/backend/prisma/migrations/00000000000002_persian_fts/migration.sql

@@ -0,0 +1,31 @@
+-- Persian normalization fn (idempotent via OR REPLACE).
+CREATE OR REPLACE FUNCTION teknav_norm_fa(t text)
+RETURNS text LANGUAGE sql IMMUTABLE PARALLEL SAFE AS $$
+  SELECT regexp_replace(
+    translate(
+      coalesce(t, ''),
+      E'يكأإآٱ‌ـًٌٍَُِّْ،؛؟',
+      E'یکاااا                ,;?'
+    ),
+    '\s+', ' ', 'g'
+  );
+$$;
+
+-- Trigram support for autocomplete / fuzzy matching.
+CREATE EXTENSION IF NOT EXISTS pg_trgm;
+
+-- Weighted tsvector computed column (A=title, B=subtitle+summary, C=content).
+ALTER TABLE "Article"
+  ADD COLUMN IF NOT EXISTS "search_tsv" tsvector
+  GENERATED ALWAYS AS (
+    setweight(to_tsvector('simple', teknav_norm_fa("title")),                    'A') ||
+    setweight(to_tsvector('simple', teknav_norm_fa(coalesce("subtitle", ''))),  'B') ||
+    setweight(to_tsvector('simple', teknav_norm_fa("summary")),                 'B') ||
+    setweight(to_tsvector('simple', teknav_norm_fa("content")),                 'C')
+  ) STORED;
+
+-- GIN index for full-text search.
+CREATE INDEX IF NOT EXISTS "Article_search_tsv_idx" ON "Article" USING GIN ("search_tsv");
+
+-- Trigram index for title autocomplete.
+CREATE INDEX IF NOT EXISTS "Article_title_trgm_idx" ON "Article" USING GIN ("title" gin_trgm_ops);