feat: enforce unique project prefixes in repository, UI, and database

migrations/004-unique-project-prefix.sql

@@ -0,0 +1,5 @@
+-- Up
+CREATE UNIQUE INDEX idx_project_prefix ON Project(Prefix COLLATE NOCASE);
+
+-- Down
+DROP INDEX idx_project_prefix;

src/main/repositories/ProjectRepository.ts

@@ -12,19 +12,36 @@ export class ProjectRepository {
     return await db.all('SELECT * FROM Project ORDER BY Title ASC');
   }
 
+  async getByPrefix(prefix: string): Promise<Project | undefined> {
+    const db = getDatabase();
+    return await db.get('SELECT * FROM Project WHERE UPPER(Prefix) = UPPER(?)', [prefix]);
+  }
+
   async create(project: { title: string; prefix: string; startDate?: string; dueDate?: string; ownerId?: number; taskSourceId?: number }) {
+    const normalizedPrefix = project.prefix.toUpperCase();
+    const existing = await this.getByPrefix(normalizedPrefix);
+    if (existing) {
+      throw new Error(`Project with prefix "${normalizedPrefix}" already exists.`);
+    }
+
     const db = getDatabase();
     return await db.run(
       'INSERT INTO Project (Title, Prefix, StartDate, DueDate, OwnerId, TaskSourceId) VALUES (?, ?, ?, ?, ?, ?)',
-      [project.title, project.prefix, project.startDate || null, project.dueDate || null, project.ownerId || null, project.taskSourceId || null]
+      [project.title, normalizedPrefix, project.startDate || null, project.dueDate || null, project.ownerId || null, project.taskSourceId || null]
     );
   }
 
   async update(project: { id: number; title: string; prefix: string; startDate?: string; dueDate?: string; ownerId?: number; taskSourceId?: number }) {
+    const normalizedPrefix = project.prefix.toUpperCase();
+    const existing = await this.getByPrefix(normalizedPrefix);
+    if (existing && existing.Id !== project.id) {
+      throw new Error(`Project with prefix "${normalizedPrefix}" already exists.`);
+    }
+
     const db = getDatabase();
     return await db.run(
       'UPDATE Project SET Title = ?, Prefix = ?, StartDate = ?, DueDate = ?, OwnerId = ?, TaskSourceId = ? WHERE Id = ?',
-      [project.title, project.prefix, project.startDate || null, project.dueDate || null, project.ownerId || null, project.taskSourceId || null, project.id]
+      [project.title, normalizedPrefix, project.startDate || null, project.dueDate || null, project.ownerId || null, project.taskSourceId || null, project.id]
     );
   }
 }

src/renderer/components/shared/ProjectModal.tsx

@@ -32,9 +32,11 @@ const ProjectModal: React.FC<ProjectModalProps> = ({
   const [ownerId, setOwnerId] = useState<number | ''>('');
   const [taskSourceId, setTaskSourceId] = useState<number | ''>('');
   const [isSubmitting, setIsSubmitting] = useState(false);
+  const [error, setError] = useState<string | null>(null);
 
   useEffect(() => {
     if (show) {
+      setError(null);
       if (initialData) {
         setTitle(initialData.Title || '');
         setPrefix(initialData.Prefix || '');
@@ -59,6 +61,7 @@ const ProjectModal: React.FC<ProjectModalProps> = ({
     if (!title.trim() || !prefix.trim()) return;
 
     setIsSubmitting(true);
+    setError(null);
     try {
       await onSave({
         title,
@@ -69,9 +72,10 @@ const ProjectModal: React.FC<ProjectModalProps> = ({
         taskSourceId: taskSourceId === '' ? undefined : taskSourceId,
       });
       onClose();
-    } catch (error) {
+    } catch (error: any) {
       console.error('Failed to save project:', error);
-      alert('Error saving project. Please try again.');
+      const message = error.message || 'Error saving project. Please try again.';
+      setError(message.replace('Error invoking remote method \'create-project\': Error: ', '').replace('Error invoking remote method \'update-project\': Error: ', ''));
     } finally {
       setIsSubmitting(false);
     }
@@ -93,6 +97,12 @@ const ProjectModal: React.FC<ProjectModalProps> = ({
         </>
       }
     >
+      {error && (
+        <div className="alert alert-danger py-2 mb-3" role="alert">
+          <i className="bi bi-exclamation-triangle-fill me-2"></i>
+          {error}
+        </div>
+      )}
       <div className="row g-3">
         <div className="col-md-9 mb-3">
           <label htmlFor="projectTitle" className="form-label">Project Title</label>