make some overall QoL improvements

src/db/repositories.js

@@ -381,7 +381,7 @@ export function createRepositories(db, config) {
         deleteChatMessage: db.prepare("DELETE FROM chat_messages WHERE id = ? AND chat_id = ?"),
         deleteChatMessages: db.prepare("DELETE FROM chat_messages WHERE chat_id = ?"),
         searchChats: db.prepare(`
-            SELECT DISTINCT cs.id,
+            SELECT cs.id,
                             CASE
                                 WHEN cs.assistant_persona_id IS NOT NULL AND cs.source_chat_id IS NULL THEN COALESCE(p.name, cs.title)
                                 ELSE cs.title
@@ -408,18 +408,23 @@ export function createRepositories(db, config) {
                             cs.system_instruction,
                             cs.created_at,
                             cs.updated_at,
+                            cm.id AS matched_message_id,
                             cm.content AS matched_content
             FROM chat_sessions cs
                      LEFT JOIN personas p ON p.id = cs.assistant_persona_id
                      LEFT JOIN personas up ON up.id = cs.user_persona_id
-                     LEFT JOIN chat_messages cm ON cm.chat_id = cs.id
+                     LEFT JOIN chat_messages cm ON cm.id = (
+                         SELECT m.id FROM chat_messages m
+                         WHERE m.chat_id = cs.id AND LOWER(m.content) LIKE ?
+                         ORDER BY m.id DESC LIMIT 1
+                     )
             WHERE cs.username = ?
               AND (
                 LOWER(CASE
                           WHEN cs.assistant_persona_id IS NOT NULL AND cs.source_chat_id IS NULL THEN COALESCE(p.name, cs.title)
                           ELSE cs.title
                     END) LIKE ?
-                    OR LOWER(COALESCE(cm.content, '')) LIKE ?
+                    OR cm.id IS NOT NULL
               )
             ORDER BY cs.is_pinned DESC, datetime(cs.updated_at) DESC
         `),
@@ -714,6 +719,9 @@ export function createRepositories(db, config) {
     };
 
     const renameUserTransaction = db.transaction((currentUsername, nextUsername) => {
+        // Existing username references do not all cascade on update. Check them at commit,
+        // after every owned row has been moved to the new username.
+        db.pragma("defer_foreign_keys = ON");
         statements.updateUsername.run(nextUsername, currentUsername);
         statements.updateChatSessionsUsername.run(nextUsername, currentUsername);
         statements.updatePersonasUsername.run(nextUsername, currentUsername);
@@ -945,7 +953,7 @@ export function createRepositories(db, config) {
         listChats: (username) => statements.listChatSessions.all(username),
         searchChats(username, query) {
             const like = `%${String(query || "").trim().toLowerCase()}%`;
-            return statements.searchChats.all(username, like, like);
+            return statements.searchChats.all(like, username, like);
         },
         countChats: (username) => statements.countChatSessions.get(username).count,
         getChat: (chatId, username) => statements.getChatSession.get(chatId, username),