Checkpoint: Ajout de l'onglet "Signatures" dans la page Paramètres : table DB signatures (firstName, lastName, imageKey, imageUrl), migration appliquée, routes tRPC (list, upload, create, delete), composant SignaturesSection avec formulaire d'ajout (prénom+nom+upload image), grille d'affichage des signatures avec aperçu, bouton de suppression au survol

server/db.ts

@@ -32,7 +32,10 @@ import {
   AutomationRule,
   llmFieldsConfig,
   InsertLlmFieldConfig,
-  LlmFieldConfig
+  LlmFieldConfig,
+  signatures,
+  InsertSignature,
+  Signature
 } from "../drizzle/schema";
 import { ENV } from './_core/env';
 
@@ -667,3 +670,34 @@ export async function initializeDefaultLlmFields(userId: number): Promise<void>
     }
   }
 }
+
+// ============= SIGNATURES HELPERS =============
+
+export async function getSignaturesByUser(userId: number): Promise<Signature[]> {
+  const db = await getDb();
+  if (!db) return [];
+  return db.select().from(signatures).where(eq(signatures.userId, userId));
+}
+
+export async function getSignatureById(id: number): Promise<Signature | undefined> {
+  const db = await getDb();
+  if (!db) return undefined;
+  const results = await db.select().from(signatures).where(eq(signatures.id, id));
+  return results[0];
+}
+
+export async function createSignature(data: InsertSignature): Promise<Signature> {
+  const db = await getDb();
+  if (!db) throw new Error("Database not available");
+  const result = await db.insert(signatures).values(data);
+  const insertId = (result[0] as any).insertId;
+  const created = await getSignatureById(insertId);
+  if (!created) throw new Error("Failed to retrieve created signature");
+  return created;
+}
+
+export async function deleteSignature(id: number): Promise<void> {
+  const db = await getDb();
+  if (!db) return;
+  await db.delete(signatures).where(eq(signatures.id, id));
+}