diff --git a/TODO.md b/TODO.md
index a78e203..6c1ff3b 100644
--- a/TODO.md
+++ b/TODO.md
@@ -408,7 +408,7 @@ Goal: rename the tables and column to the canonical M2M pattern (`tags`, `thesis
       into `$problematique` but the value is **never used** (no matching column, no INSERT reference).
       Deleted.
 
-- [ ] **`setThesisJury()` not wrapped in a transaction** — the method does a DELETE then multiple
+- [x] **`setThesisJury()` not wrapped in a transaction** — the method does a DELETE then multiple
       INSERTs with no transaction guard of its own. If called from outside a transaction (e.g. a
       future API endpoint) a partial failure leaves orphaned rows. Wrap the body in
       `BEGIN … COMMIT / ROLLBACK` (check `$this->pdo->inTransaction()` to avoid nesting).
@@ -551,7 +551,7 @@ Goal: rename the tables and column to the canonical M2M pattern (`tags`, `thesis
 
 ### H — Minor / low-hanging fruit
 
-- [ ] **`admin/thanks.php` duplicates `getThesisFiles()` with a raw PDO query** — lines 34–40
+- [x] **`admin/thanks.php` duplicates `getThesisFiles()` with a raw PDO query** — lines 34–40
       manually prepare `SELECT … FROM thesis_files WHERE thesis_id = ?` instead of calling
       `$db->getThesisFiles($thesisId)` which already exists. Replace with the DB method.
 
diff --git a/public/admin/thanks.php b/public/admin/thanks.php
index 0e51e31..f1de16f 100644
--- a/public/admin/thanks.php
+++ b/public/admin/thanks.php
@@ -25,7 +25,6 @@ if (isset($_GET['id'])) {
     if ($thesisId !== false && $thesisId > 0) {
         try {
             $db = new Database();
-            $pdo = $db->getPDO();
 
             // Get thesis data
             $thesis = $db->getThesis($thesisId);
@@ -33,15 +32,7 @@ if (isset($_GET['id'])) {
             if (!$thesis) {
                 $error = "TFE non trouvé.";
             } else {
-                // Get associated files
-                $stmt = $pdo->prepare("
-                    SELECT file_type, file_name, file_size, mime_type, uploaded_at
-                    FROM thesis_files
-                    WHERE thesis_id = ?
-                    ORDER BY file_type, uploaded_at
-                ");
-                $stmt->execute([$thesisId]);
-                $files = $stmt->fetchAll();
+                $files = $db->getThesisFiles($thesisId);
             }
         } catch (Exception $e) {
             error_log("Error loading thesis: " . $e->getMessage());
diff --git a/src/Database.php b/src/Database.php
index 2b6e734..257b6b4 100644
--- a/src/Database.php
+++ b/src/Database.php
@@ -812,19 +812,33 @@ class Database {
      * $juryMembers: array of ['name' => string, 'role' => string, 'is_external' => int]
      */
     public function setThesisJury(int $thesisId, array $juryMembers): void {
-        $this->pdo->prepare("DELETE FROM thesis_supervisors WHERE thesis_id = ?")->execute([$thesisId]);
-        $stmt = $this->pdo->prepare("
-            INSERT INTO thesis_supervisors (thesis_id, supervisor_id, role, is_external, supervisor_order)
-            VALUES (?, ?, ?, ?, ?)
-        ");
-        foreach ($juryMembers as $order => $member) {
-            $name = trim($member['name'] ?? '');
-            if ($name === '') continue;
-            $supervisorId = $this->findOrCreateSupervisor($name);
-            $role       = in_array($member['role'], ['president', 'promoteur', 'lecteur'])
-                            ? $member['role'] : 'promoteur';
-            $isExternal = isset($member['is_external']) ? (int)$member['is_external'] : 0;
-            $stmt->execute([$thesisId, $supervisorId, $role, $isExternal, $order + 1]);
+        $alreadyInTransaction = $this->pdo->inTransaction();
+        if (!$alreadyInTransaction) {
+            $this->pdo->beginTransaction();
+        }
+        try {
+            $this->pdo->prepare("DELETE FROM thesis_supervisors WHERE thesis_id = ?")->execute([$thesisId]);
+            $stmt = $this->pdo->prepare("
+                INSERT INTO thesis_supervisors (thesis_id, supervisor_id, role, is_external, supervisor_order)
+                VALUES (?, ?, ?, ?, ?)
+            ");
+            foreach ($juryMembers as $order => $member) {
+                $name = trim($member['name'] ?? '');
+                if ($name === '') continue;
+                $supervisorId = $this->findOrCreateSupervisor($name);
+                $role       = in_array($member['role'], ['president', 'promoteur', 'lecteur'])
+                                ? $member['role'] : 'promoteur';
+                $isExternal = isset($member['is_external']) ? (int)$member['is_external'] : 0;
+                $stmt->execute([$thesisId, $supervisorId, $role, $isExternal, $order + 1]);
+            }
+            if (!$alreadyInTransaction) {
+                $this->pdo->commit();
+            }
+        } catch (\Throwable $e) {
+            if (!$alreadyInTransaction && $this->pdo->inTransaction()) {
+                $this->pdo->rollBack();
+            }
+            throw $e;
         }
     }