Checkpoint: Correction robuste des doublons de factures : empreinte SHA-256 unique des PDF sources, détection globale avant import manuel/email/dossier/web, verrou contre les vérifications IMAP concurrentes, attente réelle de fin de traitement avant marquage lu, migration et tests de non-régression.

server/folderImportService.ts

@@ -4,6 +4,7 @@ import path from "path";
 import {
   getImportSettingsByUser,
   createSourceFile,
+  getSourceFileByContentHash,
   updateSourceFile,
   getUserSettings,
   findDuplicateInvoice,
@@ -11,7 +12,8 @@ import {
   createImportLog,
 } from "./db";
 import { extractInvoicesWithMistral, generateMetadataJSON } from "./invoiceExtractor";
-import { localStoragePut, generateStorageKey } from "./localStorage";
+import { localStorageDelete, localStoragePut, generateStorageKey } from "./localStorage";
+import { calculateFileSha256 } from "./fileFingerprint";
 import { sendImportNotification } from "./notificationService";
 
 interface FolderImportConfig {
@@ -41,6 +43,13 @@ async function processFolderFile(
     // Read the file
     const fileBuffer = await fs.readFile(filePath);
     console.log(`[FolderImport] File size: ${fileBuffer.length} bytes`);
+
+    const contentHash = calculateFileSha256(fileBuffer);
+    const existingSource = await getSourceFileByContentHash(contentHash);
+    if (existingSource) {
+      console.log(`[FolderImport] PDF déjà importé, fichier ignoré: ${fileName}`);
+      return { success: true, imported: 0, duplicates: 1, errors: 0 };
+    }
     
     // Store source file
     const sourceFileKey = generateStorageKey(userId, fileName);
@@ -57,13 +66,23 @@ async function processFolderFile(
     }
     
     // Create source file record
-    const sourceFile = await createSourceFile({
-      userId,
-      fileName,
-      fileKey: sourceFileKey,
-      fileUrl: sourceFileUrl,
-      processingStatus: "processing",
-    });
+    let sourceFile;
+    try {
+      sourceFile = await createSourceFile({
+        userId,
+        fileName,
+        fileKey: sourceFileKey,
+        fileUrl: sourceFileUrl,
+        contentHash,
+        processingStatus: "processing",
+      });
+    } catch (error: any) {
+      if (error?.code === "ER_DUP_ENTRY" || error?.errno === 1062) {
+        await localStorageDelete(sourceFileKey).catch(() => undefined);
+        return { success: true, imported: 0, duplicates: 1, errors: 0 };
+      }
+      throw error;
+    }
     
     console.log(`[FolderImport] Source file record created with ID: ${sourceFile.id}`);