feat(JiraSync): enhance synchronization logic to preserve original Jira actions and detect changes

- Updated the Jira synchronization process to include original Jira actions for better detail retention.
- Implemented a new function to detect real changes and preserved fields during task synchronization.
- Enhanced the UI to display actions with preserved fields separately for improved clarity.
- Added comprehensive tests for the new change detection logic to ensure accuracy and reliability.

src/app/api/jira/sync/route.ts

@@ -118,6 +118,17 @@ export async function POST(request: Request) {
     const syncResult = await jiraService.syncTasks(session.user.id);
 
     // Convertir SyncResult en JiraSyncResult pour le client
+    // Utiliser les actions Jira originales si disponibles pour préserver les détails (changes, etc.)
+    const actions =
+      syncResult.jiraActions ||
+      syncResult.actions.map((action) => ({
+        type: action.type as 'created' | 'updated' | 'skipped' | 'deleted',
+        taskKey: action.itemId.toString(),
+        taskTitle: action.title,
+        reason: action.message,
+        changes: action.message ? [action.message] : undefined,
+      }));
+
     const jiraSyncResult = {
       success: syncResult.success,
       tasksFound: syncResult.totalItems,
@@ -127,13 +138,7 @@ export async function POST(request: Request) {
       tasksDeleted: syncResult.stats.deleted,
       errors: syncResult.errors,
       unknownStatuses: syncResult.unknownStatuses || [], // Nouveaux statuts inconnus
-      actions: syncResult.actions.map((action) => ({
-        type: action.type as 'created' | 'updated' | 'skipped' | 'deleted',
-        taskKey: action.itemId.toString(),
-        taskTitle: action.title,
-        reason: action.message,
-        changes: action.message ? [action.message] : undefined,
-      })),
+      actions,
     };
 
     if (syncResult.success) {

src/components/jira/JiraSync.tsx

@@ -395,9 +395,157 @@ function SyncActionsList({ actions }: { actions: JiraSyncAction[] }) {
     {} as Record<string, JiraSyncAction[]>
   );
 
+  // Ordre d'affichage : créées, mises à jour, supprimées, ignorées (toujours en dernier)
+  const displayOrder: JiraSyncAction['type'][] = [
+    'created',
+    'updated',
+    'deleted',
+    'skipped',
+  ];
+
   return (
     <div className="space-y-6">
-      {Object.entries(groupedActions).map(([type, typeActions]) => (
+      {displayOrder
+        .filter((type) => groupedActions[type]?.length > 0)
+        .map((type) => {
+          const typeActions = groupedActions[type];
+
+          // Pour les actions skipped, séparer celles avec champs préservés de celles sans changement
+          if (type === 'skipped') {
+            const withPreservedFields = typeActions.filter(
+              (action) => action.changes && action.changes.length > 0
+            );
+            const withoutChanges = typeActions.filter(
+              (action) => !action.changes || action.changes.length === 0
+            );
+
+            return (
+              <div key={type} className="space-y-4">
+                <h4
+                  className={`font-bold text-sm flex items-center gap-2 ${getActionColor(type as JiraSyncAction['type'])}`}
+                >
+                  {getActionIcon(type as JiraSyncAction['type'])}
+                  {getActionLabel(type as JiraSyncAction['type'])} (
+                  {typeActions.length})
+                </h4>
+
+                {/* Tâches avec champs préservés */}
+                {withPreservedFields.length > 0 && (
+                  <div className="space-y-3">
+                    <div className="text-xs font-semibold text-[var(--muted-foreground)] uppercase tracking-wide flex items-center gap-2">
+                      <div className="h-px flex-1 bg-[var(--border)]"></div>
+                      <span className="text-orange-400">
+                        Avec champs préservés ({withPreservedFields.length})
+                      </span>
+                      <div className="h-px flex-1 bg-[var(--border)]"></div>
+                    </div>
+                    <div className="space-y-2">
+                      {withPreservedFields.map((action, index) => (
+                        <div
+                          key={index}
+                          className="p-2 bg-[var(--muted)]/10 rounded border border-orange-400/30"
+                        >
+                          <div className="flex items-start justify-between gap-3">
+                            <div className="flex-1 min-w-0">
+                              <div className="flex items-baseline gap-2">
+                                <span className="font-mono text-sm font-bold text-[var(--foreground)] shrink-0">
+                                  {action.taskKey}
+                                </span>
+                                <span className="text-sm text-[var(--muted-foreground)] truncate">
+                                  {action.taskTitle}
+                                </span>
+                              </div>
+                            </div>
+                            <Badge
+                              variant="outline"
+                              size="sm"
+                              className="shrink-0"
+                            >
+                              {getActionLabel(action.type)}
+                            </Badge>
+                          </div>
+
+                          {action.reason && (
+                            <div className="mt-1 text-xs text-[var(--muted-foreground)] italic">
+                              <Emoji emoji="💡" /> {action.reason}
+                            </div>
+                          )}
+
+                          {action.changes && action.changes.length > 0 && (
+                            <div className="mt-1 space-y-0.5">
+                              <div className="text-xs font-medium text-[var(--muted-foreground)]">
+                                Champs préservés:
+                              </div>
+                              {action.changes.map((change, changeIndex) => (
+                                <div
+                                  key={changeIndex}
+                                  className="text-xs font-mono text-[var(--foreground)] pl-2 border-l-2 border-orange-400/30"
+                                >
+                                  {change}
+                                </div>
+                              ))}
+                            </div>
+                          )}
+                        </div>
+                      ))}
+                    </div>
+                  </div>
+                )}
+
+                {/* Tâches sans changement */}
+                {withoutChanges.length > 0 && (
+                  <div className="space-y-3">
+                    {withPreservedFields.length > 0 && (
+                      <div className="text-xs font-semibold text-[var(--muted-foreground)] uppercase tracking-wide flex items-center gap-2">
+                        <div className="h-px flex-1 bg-[var(--border)]"></div>
+                        <span className="text-[var(--muted-foreground)]">
+                          Aucun changement ({withoutChanges.length})
+                        </span>
+                        <div className="h-px flex-1 bg-[var(--border)]"></div>
+                      </div>
+                    )}
+                    <div className="space-y-2">
+                      {withoutChanges.map((action, index) => (
+                        <div
+                          key={index}
+                          className="p-2 bg-[var(--muted)]/5 rounded border border-[var(--border)] opacity-75"
+                        >
+                          <div className="flex items-start justify-between gap-3">
+                            <div className="flex-1 min-w-0">
+                              <div className="flex items-baseline gap-2">
+                                <span className="font-mono text-sm font-bold text-[var(--muted-foreground)] shrink-0">
+                                  {action.taskKey}
+                                </span>
+                                <span className="text-sm text-[var(--muted-foreground)] truncate">
+                                  {action.taskTitle}
+                                </span>
+                              </div>
+                            </div>
+                            <Badge
+                              variant="outline"
+                              size="sm"
+                              className="shrink-0 opacity-75"
+                            >
+                              {getActionLabel(action.type)}
+                            </Badge>
+                          </div>
+
+                          {action.reason && (
+                            <div className="mt-1 text-xs text-[var(--muted-foreground)] italic">
+                              <Emoji emoji="💡" /> {action.reason}
+                            </div>
+                          )}
+                        </div>
+                      ))}
+                    </div>
+                  </div>
+                )}
+              </div>
+            );
+          }
+
+          // Pour les autres types, affichage normal
+          return (
             <div key={type} className="space-y-3">
               <h4
                 className={`font-bold text-sm flex items-center gap-2 ${getActionColor(type as JiraSyncAction['type'])}`}
@@ -454,7 +602,8 @@ function SyncActionsList({ actions }: { actions: JiraSyncAction[] }) {
                 ))}
               </div>
             </div>
-      ))}
+          );
+        })}
     </div>
   );
 }

src/components/settings/tfs/TfsSync.tsx

@@ -383,9 +383,157 @@ function SyncActionsList({ actions }: { actions: TfsSyncAction[] }) {
     {} as Record<string, TfsSyncAction[]>
   );
 
+  // Ordre d'affichage : créées, mises à jour, supprimées, ignorées (toujours en dernier)
+  const displayOrder: TfsSyncAction['type'][] = [
+    'created',
+    'updated',
+    'deleted',
+    'skipped',
+  ];
+
   return (
     <div className="space-y-6">
-      {Object.entries(groupedActions).map(([type, typeActions]) => (
+      {displayOrder
+        .filter((type) => groupedActions[type]?.length > 0)
+        .map((type) => {
+          const typeActions = groupedActions[type] as TfsSyncAction[];
+
+          // Pour les actions skipped, séparer celles avec champs préservés de celles sans changement
+          if (type === 'skipped') {
+            const withPreservedFields = typeActions.filter(
+              (action) => action.changes && action.changes.length > 0
+            );
+            const withoutChanges = typeActions.filter(
+              (action) => !action.changes || action.changes.length === 0
+            );
+
+            return (
+              <div key={type} className="space-y-4">
+                <h4
+                  className={`font-bold text-sm flex items-center gap-2 ${getActionColor(type as TfsSyncAction['type'])}`}
+                >
+                  {getActionIcon(type as TfsSyncAction['type'])}
+                  {getActionLabel(type as TfsSyncAction['type'])} (
+                  {typeActions.length})
+                </h4>
+
+                {/* PRs avec champs préservés */}
+                {withPreservedFields.length > 0 && (
+                  <div className="space-y-3">
+                    <div className="text-xs font-semibold text-[var(--muted-foreground)] uppercase tracking-wide flex items-center gap-2">
+                      <div className="h-px flex-1 bg-[var(--border)]"></div>
+                      <span className="text-orange-400">
+                        Avec champs préservés ({withPreservedFields.length})
+                      </span>
+                      <div className="h-px flex-1 bg-[var(--border)]"></div>
+                    </div>
+                    <div className="space-y-2">
+                      {withPreservedFields.map((action, index) => (
+                        <div
+                          key={index}
+                          className="p-2 bg-[var(--muted)]/10 rounded border border-orange-400/30"
+                        >
+                          <div className="flex items-start justify-between gap-3">
+                            <div className="flex-1 min-w-0">
+                              <div className="flex items-baseline gap-2">
+                                <span className="font-mono text-sm font-bold text-[var(--foreground)] shrink-0">
+                                  PR #{action.pullRequestId}
+                                </span>
+                                <span className="text-sm text-[var(--muted-foreground)] truncate">
+                                  {action.prTitle}
+                                </span>
+                              </div>
+                            </div>
+                            <Badge
+                              variant="outline"
+                              size="sm"
+                              className="shrink-0"
+                            >
+                              {getActionLabel(action.type)}
+                            </Badge>
+                          </div>
+
+                          {action.reason && (
+                            <div className="mt-1 text-xs text-[var(--muted-foreground)] italic">
+                              💡 {action.reason}
+                            </div>
+                          )}
+
+                          {action.changes && action.changes.length > 0 && (
+                            <div className="mt-1 space-y-0.5">
+                              <div className="text-xs font-medium text-[var(--muted-foreground)]">
+                                Champs préservés:
+                              </div>
+                              {action.changes.map((change, changeIndex) => (
+                                <div
+                                  key={changeIndex}
+                                  className="text-xs font-mono text-[var(--foreground)] pl-2 border-l-2 border-orange-400/30"
+                                >
+                                  {change}
+                                </div>
+                              ))}
+                            </div>
+                          )}
+                        </div>
+                      ))}
+                    </div>
+                  </div>
+                )}
+
+                {/* PRs sans changement */}
+                {withoutChanges.length > 0 && (
+                  <div className="space-y-3">
+                    {withPreservedFields.length > 0 && (
+                      <div className="text-xs font-semibold text-[var(--muted-foreground)] uppercase tracking-wide flex items-center gap-2">
+                        <div className="h-px flex-1 bg-[var(--border)]"></div>
+                        <span className="text-[var(--muted-foreground)]">
+                          Aucun changement ({withoutChanges.length})
+                        </span>
+                        <div className="h-px flex-1 bg-[var(--border)]"></div>
+                      </div>
+                    )}
+                    <div className="space-y-2">
+                      {withoutChanges.map((action, index) => (
+                        <div
+                          key={index}
+                          className="p-2 bg-[var(--muted)]/5 rounded border border-[var(--border)] opacity-75"
+                        >
+                          <div className="flex items-start justify-between gap-3">
+                            <div className="flex-1 min-w-0">
+                              <div className="flex items-baseline gap-2">
+                                <span className="font-mono text-sm font-bold text-[var(--muted-foreground)] shrink-0">
+                                  PR #{action.pullRequestId}
+                                </span>
+                                <span className="text-sm text-[var(--muted-foreground)] truncate">
+                                  {action.prTitle}
+                                </span>
+                              </div>
+                            </div>
+                            <Badge
+                              variant="outline"
+                              size="sm"
+                              className="shrink-0 opacity-75"
+                            >
+                              {getActionLabel(action.type)}
+                            </Badge>
+                          </div>
+
+                          {action.reason && (
+                            <div className="mt-1 text-xs text-[var(--muted-foreground)] italic">
+                              💡 {action.reason}
+                            </div>
+                          )}
+                        </div>
+                      ))}
+                    </div>
+                  </div>
+                )}
+              </div>
+            );
+          }
+
+          // Pour les autres types, affichage normal
+          return (
             <div key={type} className="space-y-3">
               <h4
                 className={`font-bold text-sm flex items-center gap-2 ${getActionColor(type as TfsSyncAction['type'])}`}
@@ -442,7 +590,8 @@ function SyncActionsList({ actions }: { actions: TfsSyncAction[] }) {
                 ))}
               </div>
             </div>
-      ))}
+          );
+        })}
     </div>
   );
 }

src/components/tfs/TfsSync.tsx

@@ -383,21 +383,168 @@ function SyncActionsList({ actions }: { actions: TfsSyncAction[] }) {
     {} as Record<string, TfsSyncAction[]>
   );
 
+  // Ordre d'affichage : créées, mises à jour, supprimées, ignorées (toujours en dernier)
+  const displayOrder: TfsSyncAction['type'][] = [
+    'created',
+    'updated',
+    'deleted',
+    'skipped',
+  ];
+
   return (
     <div className="space-y-6">
-      {Object.entries(groupedActions).map(([type, typeActions]) => (
+      {displayOrder
+        .filter((type) => groupedActions[type]?.length > 0)
+        .map((type) => {
+          const typeActions = groupedActions[type] as TfsSyncAction[];
+
+          // Pour les actions skipped, séparer celles avec champs préservés de celles sans changement
+          if (type === 'skipped') {
+            const withPreservedFields = typeActions.filter(
+              (action) => action.changes && action.changes.length > 0
+            );
+            const withoutChanges = typeActions.filter(
+              (action) => !action.changes || action.changes.length === 0
+            );
+
+            return (
+              <div key={type} className="space-y-4">
+                <h4
+                  className={`font-bold text-sm flex items-center gap-2 ${getActionColor(type as TfsSyncAction['type'])}`}
+                >
+                  {getActionIcon(type as TfsSyncAction['type'])}
+                  {getActionLabel(type as TfsSyncAction['type'])} (
+                  {typeActions.length})
+                </h4>
+
+                {/* PRs avec champs préservés */}
+                {withPreservedFields.length > 0 && (
+                  <div className="space-y-3">
+                    <div className="text-xs font-semibold text-[var(--muted-foreground)] uppercase tracking-wide flex items-center gap-2">
+                      <div className="h-px flex-1 bg-[var(--border)]"></div>
+                      <span className="text-orange-400">
+                        Avec champs préservés ({withPreservedFields.length})
+                      </span>
+                      <div className="h-px flex-1 bg-[var(--border)]"></div>
+                    </div>
+                    <div className="space-y-2">
+                      {withPreservedFields.map((action, index) => (
+                        <div
+                          key={index}
+                          className="p-2 bg-[var(--muted)]/10 rounded border border-orange-400/30"
+                        >
+                          <div className="flex items-start justify-between gap-3">
+                            <div className="flex-1 min-w-0">
+                              <div className="flex items-baseline gap-2">
+                                <span className="font-mono text-sm font-bold text-[var(--foreground)] shrink-0">
+                                  PR #{action.pullRequestId}
+                                </span>
+                                <span className="text-sm text-[var(--muted-foreground)] truncate">
+                                  {action.prTitle}
+                                </span>
+                              </div>
+                            </div>
+                            <Badge
+                              variant="outline"
+                              size="sm"
+                              className="shrink-0"
+                            >
+                              {getActionLabel(action.type)}
+                            </Badge>
+                          </div>
+
+                          {action.reason && (
+                            <div className="mt-1 text-xs text-[var(--muted-foreground)] italic">
+                              💡 {action.reason}
+                            </div>
+                          )}
+
+                          {action.changes && action.changes.length > 0 && (
+                            <div className="mt-1 space-y-0.5">
+                              <div className="text-xs font-medium text-[var(--muted-foreground)]">
+                                Champs préservés:
+                              </div>
+                              {action.changes.map((change, changeIndex) => (
+                                <div
+                                  key={changeIndex}
+                                  className="text-xs font-mono text-[var(--foreground)] pl-2 border-l-2 border-orange-400/30"
+                                >
+                                  {change}
+                                </div>
+                              ))}
+                            </div>
+                          )}
+                        </div>
+                      ))}
+                    </div>
+                  </div>
+                )}
+
+                {/* PRs sans changement */}
+                {withoutChanges.length > 0 && (
+                  <div className="space-y-3">
+                    {withPreservedFields.length > 0 && (
+                      <div className="text-xs font-semibold text-[var(--muted-foreground)] uppercase tracking-wide flex items-center gap-2">
+                        <div className="h-px flex-1 bg-[var(--border)]"></div>
+                        <span className="text-[var(--muted-foreground)]">
+                          Aucun changement ({withoutChanges.length})
+                        </span>
+                        <div className="h-px flex-1 bg-[var(--border)]"></div>
+                      </div>
+                    )}
+                    <div className="space-y-2">
+                      {withoutChanges.map((action, index) => (
+                        <div
+                          key={index}
+                          className="p-2 bg-[var(--muted)]/5 rounded border border-[var(--border)] opacity-75"
+                        >
+                          <div className="flex items-start justify-between gap-3">
+                            <div className="flex-1 min-w-0">
+                              <div className="flex items-baseline gap-2">
+                                <span className="font-mono text-sm font-bold text-[var(--muted-foreground)] shrink-0">
+                                  PR #{action.pullRequestId}
+                                </span>
+                                <span className="text-sm text-[var(--muted-foreground)] truncate">
+                                  {action.prTitle}
+                                </span>
+                              </div>
+                            </div>
+                            <Badge
+                              variant="outline"
+                              size="sm"
+                              className="shrink-0 opacity-75"
+                            >
+                              {getActionLabel(action.type)}
+                            </Badge>
+                          </div>
+
+                          {action.reason && (
+                            <div className="mt-1 text-xs text-[var(--muted-foreground)] italic">
+                              💡 {action.reason}
+                            </div>
+                          )}
+                        </div>
+                      ))}
+                    </div>
+                  </div>
+                )}
+              </div>
+            );
+          }
+
+          // Pour les autres types, affichage normal
+          return (
             <div key={type} className="space-y-3">
               <h4
                 className={`font-bold text-sm flex items-center gap-2 ${getActionColor(type as TfsSyncAction['type'])}`}
               >
                 {getActionIcon(type as TfsSyncAction['type'])}
                 {getActionLabel(type as TfsSyncAction['type'])} (
-            {(typeActions as TfsSyncAction[]).length})
+                {typeActions.length})
               </h4>
 
               <div className="space-y-2">
-            {(typeActions as TfsSyncAction[]).map(
-              (action: TfsSyncAction, index: number) => (
+                {typeActions.map((action, index) => (
                   <div
                     key={index}
                     className="p-2 bg-[var(--muted)]/10 rounded border border-[var(--border)]"
@@ -429,24 +576,22 @@ function SyncActionsList({ actions }: { actions: TfsSyncAction[] }) {
                         <div className="text-xs font-medium text-[var(--muted-foreground)]">
                           Modifications:
                         </div>
-                      {action.changes.map(
-                        (change: string, changeIndex: number) => (
+                        {action.changes.map((change, changeIndex) => (
                           <div
                             key={changeIndex}
                             className="text-xs font-mono text-[var(--foreground)] pl-2 border-l-2 border-purple-400/30"
                           >
                             {change}
                           </div>
-                        )
-                      )}
+                        ))}
                       </div>
                     )}
                   </div>
-              )
-            )}
-          </div>
-        </div>
                 ))}
               </div>
+            </div>
+          );
+        })}
+    </div>
   );
 }

src/services/integrations/jira/__tests__/sync.test.ts

@@ -4,6 +4,7 @@
 
 import { describe, it, expect } from 'vitest';
 import { buildSyncUpdateData } from '@/services/task-management/readonly-fields';
+import { detectSyncChanges } from '@/services/integrations/jira/jira';
 
 describe('Synchronisation Jira - Logique de préservation des champs', () => {
   describe('buildSyncUpdateData pour Jira', () => {
@@ -168,4 +169,263 @@ describe('Synchronisation Jira - Logique de préservation des champs', () => {
       expect(result.priority).toBe('medium'); // Préservé car modifié localement
     });
   });
+
+  describe('detectSyncChanges - Détection des changements et préservations', () => {
+    it('devrait détecter une priorité préservée localement', () => {
+      const existingTask = {
+        title: 'Tâche test',
+        description: 'Description locale',
+        status: 'todo',
+        priority: 'high', // Modifié localement
+        dueDate: null,
+        jiraProject: 'TEST',
+        jiraType: 'Task',
+        assignee: 'User',
+      };
+
+      const taskData = {
+        title: 'Tâche test',
+        description: 'Description locale',
+        status: 'todo',
+        priority: 'medium', // Valeur Jira différente
+        dueDate: null,
+        jiraProject: 'TEST',
+        jiraType: 'Task',
+        assignee: 'User',
+      };
+
+      const finalData = buildSyncUpdateData('jira', existingTask, taskData);
+
+      const { realChanges, preservedFields } = detectSyncChanges(
+        existingTask,
+        taskData,
+        finalData
+      );
+
+      expect(realChanges).toHaveLength(0);
+      expect(preservedFields).toHaveLength(1);
+      expect(preservedFields[0]).toBe(
+        'Priorité: préservée localement (high) vs Jira (medium)'
+      );
+    });
+
+    it('devrait détecter un titre préservé localement', () => {
+      const existingTask = {
+        title: 'Titre modifié localement',
+        description: 'Description',
+        status: 'todo',
+        priority: 'medium',
+        dueDate: null,
+        jiraProject: 'TEST',
+        jiraType: 'Task',
+        assignee: 'User',
+      };
+
+      const taskData = {
+        title: 'Titre original Jira',
+        description: 'Description',
+        status: 'todo',
+        priority: 'medium',
+        dueDate: null,
+        jiraProject: 'TEST',
+        jiraType: 'Task',
+        assignee: 'User',
+      };
+
+      const finalData = buildSyncUpdateData('jira', existingTask, taskData);
+
+      const { realChanges, preservedFields } = detectSyncChanges(
+        existingTask,
+        taskData,
+        finalData
+      );
+
+      expect(realChanges).toHaveLength(0);
+      expect(preservedFields).toHaveLength(1);
+      expect(preservedFields[0]).toContain('Titre: préservé localement');
+      expect(preservedFields[0]).toContain('vs Jira');
+    });
+
+    it('devrait détecter plusieurs champs préservés', () => {
+      const existingTask = {
+        title: 'Titre modifié',
+        description: 'Description',
+        status: 'todo',
+        priority: 'high', // Modifié localement
+        dueDate: null,
+        jiraProject: 'TEST',
+        jiraType: 'Task',
+        assignee: 'User',
+      };
+
+      const taskData = {
+        title: 'Titre original', // Différent
+        description: 'Description',
+        status: 'todo',
+        priority: 'medium', // Différent
+        dueDate: null,
+        jiraProject: 'TEST',
+        jiraType: 'Task',
+        assignee: 'User',
+      };
+
+      const finalData = buildSyncUpdateData('jira', existingTask, taskData);
+
+      const { realChanges, preservedFields } = detectSyncChanges(
+        existingTask,
+        taskData,
+        finalData
+      );
+
+      expect(realChanges).toHaveLength(0);
+      expect(preservedFields.length).toBeGreaterThanOrEqual(2);
+      expect(preservedFields.some((f) => f.includes('Titre'))).toBe(true);
+      expect(preservedFields.some((f) => f.includes('Priorité'))).toBe(true);
+    });
+
+    it('devrait détecter un changement réel de statut', () => {
+      const existingTask = {
+        title: 'Tâche',
+        description: 'Description',
+        status: 'todo',
+        priority: 'medium',
+        dueDate: null,
+        jiraProject: 'TEST',
+        jiraType: 'Task',
+        assignee: 'User',
+      };
+
+      const taskData = {
+        title: 'Tâche',
+        description: 'Description',
+        status: 'in_progress', // Changé dans Jira
+        priority: 'medium',
+        dueDate: null,
+        jiraProject: 'TEST',
+        jiraType: 'Task',
+        assignee: 'User',
+      };
+
+      const finalData = buildSyncUpdateData('jira', existingTask, taskData);
+
+      const { realChanges, preservedFields } = detectSyncChanges(
+        existingTask,
+        taskData,
+        finalData
+      );
+
+      expect(realChanges.length).toBeGreaterThan(0);
+      expect(realChanges.some((c) => c.includes('Statut'))).toBe(true);
+      expect(preservedFields).toHaveLength(0);
+    });
+
+    it('devrait détecter changement réel + préservation simultanés', () => {
+      const existingTask = {
+        title: 'Titre modifié localement',
+        description: 'Description locale',
+        status: 'todo',
+        priority: 'high', // Modifié localement
+        dueDate: null,
+        jiraProject: 'TEST',
+        jiraType: 'Task',
+        assignee: 'User',
+      };
+
+      const taskData = {
+        title: 'Titre original', // Différent
+        description: 'Description Jira', // Différent
+        status: 'in_progress', // Changé dans Jira
+        priority: 'medium', // Différent
+        dueDate: null,
+        jiraProject: 'TEST',
+        jiraType: 'Task',
+        assignee: 'User',
+      };
+
+      const finalData = buildSyncUpdateData('jira', existingTask, taskData);
+
+      const { realChanges, preservedFields } = detectSyncChanges(
+        existingTask,
+        taskData,
+        finalData
+      );
+
+      // Description et statut devraient être dans realChanges (écrasés)
+      expect(realChanges.length).toBeGreaterThan(0);
+      // Titre et priorité devraient être préservés
+      expect(preservedFields.length).toBeGreaterThan(0);
+      expect(preservedFields.some((f) => f.includes('Titre'))).toBe(true);
+      expect(preservedFields.some((f) => f.includes('Priorité'))).toBe(true);
+    });
+
+    it('devrait détecter aucun changement quand tout est identique', () => {
+      const existingTask = {
+        title: 'Tâche',
+        description: 'Description',
+        status: 'todo',
+        priority: 'medium',
+        dueDate: null,
+        jiraProject: 'TEST',
+        jiraType: 'Task',
+        assignee: 'User',
+      };
+
+      const taskData = {
+        title: 'Tâche',
+        description: 'Description',
+        status: 'todo',
+        priority: 'medium',
+        dueDate: null,
+        jiraProject: 'TEST',
+        jiraType: 'Task',
+        assignee: 'User',
+      };
+
+      const finalData = buildSyncUpdateData('jira', existingTask, taskData);
+
+      const { realChanges, preservedFields } = detectSyncChanges(
+        existingTask,
+        taskData,
+        finalData
+      );
+
+      expect(realChanges).toHaveLength(0);
+      expect(preservedFields).toHaveLength(0);
+    });
+
+    it('devrait détecter un changement de projet Jira', () => {
+      const existingTask = {
+        title: 'Tâche',
+        description: 'Description',
+        status: 'todo',
+        priority: 'medium',
+        dueDate: null,
+        jiraProject: 'OLD',
+        jiraType: 'Task',
+        assignee: 'User',
+      };
+
+      const taskData = {
+        title: 'Tâche',
+        description: 'Description',
+        status: 'todo',
+        priority: 'medium',
+        dueDate: null,
+        jiraProject: 'NEW', // Changé
+        jiraType: 'Task',
+        assignee: 'User',
+      };
+
+      const finalData = buildSyncUpdateData('jira', existingTask, taskData);
+
+      const { realChanges, preservedFields } = detectSyncChanges(
+        existingTask,
+        taskData,
+        finalData
+      );
+
+      expect(realChanges.length).toBeGreaterThan(0);
+      expect(realChanges.some((c) => c.includes('Projet'))).toBe(true);
+    });
+  });
 });

src/services/integrations/jira/jira.ts

@@ -46,6 +46,8 @@ export interface SyncResult {
     skipped: number;
     deleted: number;
   };
+  // Actions originales Jira avec tous les détails (changes, etc.)
+  jiraActions?: JiraSyncAction[];
 }
 
 export interface JiraSyncResult {
@@ -60,6 +62,126 @@ export interface JiraSyncResult {
   actions: JiraSyncAction[]; // Détail des actions effectuées
 }
 
+/**
+ * Interface pour les données de tâche existante
+ */
+interface ExistingTaskData {
+  title: string;
+  description: string | null;
+  status: string;
+  priority: string;
+  dueDate: Date | null;
+  jiraProject: string | null;
+  jiraType: string | null;
+  assignee: string | null;
+}
+
+/**
+ * Détecte les changements réels et les préservations lors de la synchronisation
+ * @param existingTask - Données existantes de la tâche
+ * @param taskData - Données venant de Jira (avec champs Jira spécifiques)
+ * @param finalData - Données finales après application de la logique de préservation (sans champs Jira)
+ * @returns Objet contenant les changements réels et les champs préservés
+ */
+export function detectSyncChanges(
+  existingTask: ExistingTaskData,
+  taskData: {
+    title: string;
+    description: string | null;
+    status: string;
+    priority: string;
+    dueDate: Date | null;
+    jiraProject: string;
+    jiraType: string;
+    assignee: string | null;
+  },
+  finalData: {
+    title: string;
+    description: string | null;
+    status: string;
+    priority: string;
+    dueDate: Date | null;
+  }
+): { realChanges: string[]; preservedFields: string[] } {
+  const realChanges: string[] = [];
+  const preservedFields: string[] = [];
+
+  // Détecter les changements réels et les préservations
+  // Pour chaque champ, comparer existingTask avec taskData pour voir les différences
+  if (existingTask.title !== taskData.title) {
+    if (existingTask.title !== finalData.title) {
+      // Changement réel appliqué
+      realChanges.push(`Titre: ${existingTask.title} → ${finalData.title}`);
+    } else {
+      // Valeur préservée (finalData === existingTask mais différent de taskData)
+      preservedFields.push(
+        `Titre: préservé localement ("${existingTask.title}") vs Jira ("${taskData.title}")`
+      );
+    }
+  }
+
+  if (existingTask.description !== taskData.description) {
+    if (existingTask.description !== finalData.description) {
+      realChanges.push(`Description modifiée`);
+    }
+  }
+
+  if (existingTask.status !== taskData.status) {
+    if (existingTask.status !== finalData.status) {
+      realChanges.push(`Statut: ${existingTask.status} → ${finalData.status}`);
+    } else {
+      // Valeur préservée (finalData === existingTask mais différent de taskData)
+      preservedFields.push(
+        `Statut: préservé localement (${existingTask.status}) vs Jira (${taskData.status})`
+      );
+    }
+  }
+
+  if (existingTask.priority !== taskData.priority) {
+    if (existingTask.priority !== finalData.priority) {
+      realChanges.push(
+        `Priorité: ${existingTask.priority} → ${finalData.priority}`
+      );
+    } else {
+      // Valeur préservée (finalData === existingTask mais différent de taskData)
+      preservedFields.push(
+        `Priorité: préservée localement (${existingTask.priority}) vs Jira (${taskData.priority})`
+      );
+    }
+  }
+
+  if (
+    (existingTask.dueDate?.getTime() || null) !==
+    (finalData.dueDate?.getTime() || null)
+  ) {
+    const oldDate = existingTask.dueDate
+      ? formatDateForDisplay(existingTask.dueDate)
+      : 'Aucune';
+    const newDate = finalData.dueDate
+      ? formatDateForDisplay(finalData.dueDate)
+      : 'Aucune';
+    realChanges.push(`Échéance: ${oldDate} → ${newDate}`);
+  }
+
+  if (existingTask.jiraProject !== taskData.jiraProject) {
+    realChanges.push(
+      `Projet: ${existingTask.jiraProject} → ${taskData.jiraProject}`
+    );
+  }
+
+  if (existingTask.jiraType !== taskData.jiraType) {
+    realChanges.push(`Type: ${existingTask.jiraType} → ${taskData.jiraType}`);
+  }
+
+  if (existingTask.assignee !== taskData.assignee) {
+    realChanges.push(
+      `Assigné: ${existingTask.assignee} → ${taskData.assignee}`
+    );
+  }
+
+  return { realChanges, preservedFields };
+}
+
 export class JiraService {
   readonly config: JiraConfig;
 
@@ -437,6 +559,8 @@ export class JiraService {
 
       // Déterminer le succès et enregistrer le log
       result.success = result.errors.length === 0;
+      // Ajouter les actions Jira originales pour préserver les détails (changes, etc.)
+      result.jiraActions = jiraActions;
       await this.logSync(result);
 
       console.log('✅ Synchronisation Jira terminée:', result);
@@ -531,65 +655,15 @@ export class JiraService {
       // Utiliser la logique centralisée pour déterminer quels champs préserver
       const finalData = buildSyncUpdateData('jira', existingTask, taskData);
 
-      // Détecter les changements et créer la liste des modifications
-      const changes: string[] = [];
-
-      // Détecter les changements en comparant les valeurs finales avec les existantes
-      if (existingTask.title !== finalData.title) {
-        changes.push(`Titre: ${existingTask.title} → ${finalData.title}`);
-      } else if (existingTask.title !== taskData.title) {
-        // Valeur préservée (finalData === existingTask mais différent de taskData)
-        changes.push(`Titre: préservé localement ("${existingTask.title}")`);
-      }
-
-      if (existingTask.description !== finalData.description) {
-        changes.push(`Description modifiée`);
-      }
-
-      if (existingTask.status !== finalData.status) {
-        changes.push(`Statut: ${existingTask.status} → ${finalData.status}`);
-      } else if (existingTask.status !== taskData.status) {
-        // Valeur préservée (finalData === existingTask mais différent de taskData)
-        changes.push(`Statut: préservé localement (${existingTask.status})`);
-      }
-
-      if (existingTask.priority !== finalData.priority) {
-        changes.push(
-          `Priorité: ${existingTask.priority} → ${finalData.priority}`
+      // Détecter les changements réels et préservations
+      const { realChanges, preservedFields } = detectSyncChanges(
+        existingTask,
+        taskData,
+        finalData
       );
-      } else if (existingTask.priority !== taskData.priority) {
-        // Valeur préservée (finalData === existingTask mais différent de taskData)
-        changes.push(
-          `Priorité: préservée localement (${existingTask.priority})`
-        );
-      }
-      if (
-        (existingTask.dueDate?.getTime() || null) !==
-        (finalData.dueDate?.getTime() || null)
-      ) {
-        const oldDate = existingTask.dueDate
-          ? formatDateForDisplay(existingTask.dueDate)
-          : 'Aucune';
-        const newDate = finalData.dueDate
-          ? formatDateForDisplay(finalData.dueDate)
-          : 'Aucune';
-        changes.push(`Échéance: ${oldDate} → ${newDate}`);
-      }
-      if (existingTask.jiraProject !== taskData.jiraProject) {
-        changes.push(
-          `Projet: ${existingTask.jiraProject} → ${taskData.jiraProject}`
-        );
-      }
-      if (existingTask.jiraType !== taskData.jiraType) {
-        changes.push(`Type: ${existingTask.jiraType} → ${taskData.jiraType}`);
-      }
-      if (existingTask.assignee !== taskData.assignee) {
-        changes.push(
-          `Assigné: ${existingTask.assignee} → ${taskData.assignee}`
-        );
-      }
 
-      if (changes.length === 0) {
+      // Si tous les champs sont préservés et aucun changement réel, skip
+      if (realChanges.length === 0) {
         console.log(
           `⏭️  Aucun changement pour ${jiraTask.key}, skip mise à jour`
         );
@@ -601,7 +675,8 @@ export class JiraService {
           type: 'skipped',
           taskKey: jiraTask.key,
           taskTitle: jiraTask.summary,
-          reason: 'Aucun changement détecté',
+          reason: 'Tous les champs préservés localement',
+          changes: preservedFields.length > 0 ? preservedFields : undefined,
         };
       }
 
@@ -642,14 +717,17 @@ export class JiraService {
       // S'assurer que le tag Jira est assigné (pour les anciennes tâches)
       await this.assignJiraTag(existingTask.id, userId);
 
+      // Construire la liste complète des changements (réels + préservations pour info)
+      const allChanges = [...realChanges, ...preservedFields];
+
       console.log(
-        `🔄 Tâche mise à jour (titre/priorité préservés): ${jiraTask.key} (${changes.length} changement${changes.length > 1 ? 's' : ''})`
+        `🔄 Tâche mise à jour: ${jiraTask.key} (${realChanges.length} changement${realChanges.length > 1 ? 's' : ''} réel${realChanges.length > 1 ? 's' : ''}${preservedFields.length > 0 ? `, ${preservedFields.length} préservé${preservedFields.length > 1 ? 's' : ''}` : ''})`
       );
       return {
         type: 'updated',
         taskKey: jiraTask.key,
         taskTitle: jiraTask.summary,
-        changes,
+        changes: allChanges,
       };
     }
   }