fix(search): always ensure pg_trgm extension availability for PostgreSQL search (#7845)

* fix(search): ensure pg_trgm extension availability for PostgreSQL search

- Move pg_trgm extension creation to initialization phase to ensure availability
- Add error handling for similarity search queries that depend on pg_trgm
- Add proper logging for debugging search-related issues

Fixes issues where PostgreSQL search suggestions fail due to missing or
improperly initialized pg_trgm extension, particularly in containerized
environments where extension creation timing matters.

* fix: Simplify error handling in search suggestion logic

Refactor error handling for search suggestions to simplify code.

---------

Co-authored-by: Nicolas Giard <github@ngpixel.com>

server/modules/search/postgres/engine.js

@@ -23,6 +23,9 @@ module.exports = {
   async init() {
     WIKI.logger.info(`(SEARCH/POSTGRES) Initializing...`)
 
+    // -> Ensure pg_trgm extension is available (required for similarity search)
+    await WIKI.models.knex.raw('CREATE EXTENSION IF NOT EXISTS pg_trgm')
+
     // -> Create Search Index
     const indexExists = await WIKI.models.knex.schema.hasTable('pagesVector')
     if (!indexExists) {
@@ -45,7 +48,6 @@ module.exports = {
         CREATE TABLE "pagesWords" AS SELECT word FROM ts_stat(
           'SELECT to_tsvector(''simple'', "title") || to_tsvector(''simple'', "description") || to_tsvector(''simple'', "content") FROM "pagesVector"'
         )`)
-      await WIKI.models.knex.raw('CREATE EXTENSION IF NOT EXISTS pg_trgm')
       await WIKI.models.knex.raw(`CREATE INDEX "pageWords_idx" ON "pagesWords" USING GIN (word gin_trgm_ops)`)
     }
 
@@ -81,8 +83,12 @@ module.exports = {
         ${qryEnd}
       `, qryParams)
       if (results.rows.length < 5) {
-        const suggestResults = await WIKI.models.knex.raw(`SELECT word, word <-> ? AS rank FROM "pagesWords" WHERE similarity(word, ?) > 0.2 ORDER BY rank LIMIT 5;`, [q, q])
-        suggestions = suggestResults.rows.map(r => r.word)
+        try {
+          const suggestResults = await WIKI.models.knex.raw(`SELECT word, word <-> ? AS rank FROM "pagesWords" WHERE similarity(word, ?) > 0.2 ORDER BY rank LIMIT 5;`, [q, q])
+          suggestions = suggestResults.rows.map(r => r.word)
+        } catch (err) {
+          WIKI.logger.warn(`Search Engine Suggestion Error (pg_trgm extension may be missing): ${err.message}`)
+        }
       }
       return {
         results: results.rows,