use Sqlite FTS5 for search, assume correct language codes

app/models/entry.rb

@@ -9,4 +9,36 @@ class Entry < ApplicationRecord
   enum :category, %i[word phrase proper_name title reference other]
 
   validates :category, presence: true
+
+  scope :with_category, ->(cat) { cat.present? ? where(category: cat) : all }
+
+  def self.search(query, language_code: nil)
+    return all if query.blank?
+
+    prefix = valid_lang?(language_code) ? "#{language_code}:" : ""
+    fts_query = "#{prefix}\"#{query.to_s.gsub('"', '""')}\""
+
+    joins("JOIN entries_fts ON entries_fts.rowid = entries.id")
+      .where("entries_fts MATCH ?", fts_query)
+  end
+
+  def self.starts_with(prefix, language_code:)
+    return none unless valid_lang?(language_code)
+    return all if prefix.blank?
+
+    where("#{language_code} LIKE ?", "#{sanitize_sql_like(prefix)}%")
+  end
+
+  def self.alphabetical_for(language_code)
+    return none unless valid_lang?(language_code)
+
+    where.not(language_code => [ nil, "" ])
+      .order(Arel.sql("#{language_code} ASC"))
+  end
+
+  private
+
+  def self.valid_lang?(code)
+    SupportedLanguage.valid_codes.include?(code.to_s)
+  end
 end