use Sqlite FTS5 for search, assume correct language codes

db/migrate/20260122130000_add_entries_fts.rb

@@ -0,0 +1,57 @@
+class AddEntriesFts < ActiveRecord::Migration[8.1]
+  def up
+    execute <<~SQL
+      CREATE VIRTUAL TABLE IF NOT EXISTS entries_fts USING fts5(
+        fi,
+        en,
+        sv,
+        no,
+        ru,
+        de,
+        notes,
+        content='entries',
+        content_rowid='id'
+      );
+    SQL
+
+    execute <<~SQL
+      INSERT INTO entries_fts(entries_fts) VALUES('rebuild');
+    SQL
+
+    execute <<~SQL
+      CREATE TRIGGER IF NOT EXISTS entries_fts_after_insert
+      AFTER INSERT ON entries
+      BEGIN
+        INSERT INTO entries_fts(rowid, fi, en, sv, no, ru, de, notes)
+        VALUES (new.id, new.fi, new.en, new.sv, new.no, new.ru, new.de, new.notes);
+      END;
+    SQL
+
+    execute <<~SQL
+      CREATE TRIGGER IF NOT EXISTS entries_fts_after_update
+      AFTER UPDATE ON entries
+      BEGIN
+        INSERT INTO entries_fts(entries_fts, rowid, fi, en, sv, no, ru, de, notes)
+        VALUES('delete', old.id, old.fi, old.en, old.sv, old.no, old.ru, old.de, old.notes);
+        INSERT INTO entries_fts(rowid, fi, en, sv, no, ru, de, notes)
+        VALUES (new.id, new.fi, new.en, new.sv, new.no, new.ru, new.de, new.notes);
+      END;
+    SQL
+
+    execute <<~SQL
+      CREATE TRIGGER IF NOT EXISTS entries_fts_after_delete
+      AFTER DELETE ON entries
+      BEGIN
+        INSERT INTO entries_fts(entries_fts, rowid, fi, en, sv, no, ru, de, notes)
+        VALUES('delete', old.id, old.fi, old.en, old.sv, old.no, old.ru, old.de, old.notes);
+      END;
+    SQL
+  end
+
+  def down
+    execute "DROP TRIGGER IF EXISTS entries_fts_after_insert"
+    execute "DROP TRIGGER IF EXISTS entries_fts_after_update"
+    execute "DROP TRIGGER IF EXISTS entries_fts_after_delete"
+    execute "DROP TABLE IF EXISTS entries_fts"
+  end
+end