diff --git a/.gitignore b/.gitignore
index b9eb6b5..52a29f2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,3 +22,4 @@ Thumbs.db
 .idea/
 
 /node_modules
+*.db
diff --git a/TODO.md b/TODO.md
index 0eeda79..8f492c4 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,35 +1,3 @@
-# Posterg TODO
-
-## Fixes
-- [x] Replace `mb_strtolower` with `strtolower` in admin/index.php (mbstring not available in php8.4-fpm)
-- [x] Replace `mb_strlen`/`mb_substr` with `strlen`/`substr` in student-preview.php (same root cause)
-- [x] Add `objet` column migration (production DB missing column → SQLSTATE[HY000]: table theses has no column named objet)
-
-## Logging
-- [x] `AppLogger` — structured JSON logger at `storage/logs/form-submissions.log`
-- [x] Admin formulaire: log submissions (success + error, IP, UA, author, post keys)
-- [x] Partage form: log submissions (success + error, share slug, IP, UA, post keys)
-
-## Migrations
-- [x] Migration runner (`app/migrations/run.php`) with tracking table `_migrations`
-- [x] `001_add_objet_column.sql` (handles duplicate-column gracefully)
-
-## Features
-- [x] Student name popover preview in /repertoire (zero per-hover requests)
-  - [x] `Database::getThesesByAuthorName()` query
-  - [x] `SearchController::handleStudentPreview()` HTMX endpoint
-  - [x] `/repertoire/student-preview` route in Dispatcher
-  - [x] `partials/student-preview.php` — iframe (single) or link list (multiple)
-  - [x] Updated `repertoire-index.php` — htmx hover attrs, `$studentWorks` map
-  - [x] Popover container + JS position/hide logic in `repertoire.php`
-  - [x] CSS in `repertoire.css`
-
-## File naming
-- [x] Analyse current file saving in admin/add.php and partage/index.php
-- [x] Implement author slug generation (`generateAuthorSlug`)
-- [x] Modify `handleThesisFiles`: folder = `theses/{year}/{year}_{AUTHOR_NAME}/`
-- [x] Modify `handleThesisFiles`: filename = `AUTHOR_NAME_sanitized_original.ext`
-- [x] Ensure uniqueness within same year/author (suffix `_1`, `_2`, etc.)
-- [x] Database path storage updated automatically via `insertThesisFile`
-- [ ] Test with actual uploads
-- [ ] Consider same changes for `handleCoverUpload` and `handleBannerUpload`
+[ ] Describe commit
+[ ] Squash/clean up if needed
+[x] Commit and finalize
diff --git a/app/src/Database.php b/app/src/Database.php
index b4152f0..686edfa 100644
--- a/app/src/Database.php
+++ b/app/src/Database.php
@@ -1524,11 +1524,22 @@ class Database {
      * number. Must be called inside the same transaction that performs the INSERT so that
      * concurrent requests cannot produce duplicate identifiers.
      */
+    /**
+     * Generate a unique identifier like "2025-003" for a new thesis.
+     *
+     * Uses the actual maximum sequence number for the given year (from
+     * existing identifiers) rather than the row count, so deletes don't
+     * cause identifier collisions.
+     *
+     * Must be called inside an open transaction.
+     */
     public function generateThesisIdentifier(int $year): string {
-        $stmt = $this->pdo->prepare("SELECT COUNT(*) FROM theses WHERE year = ?");
-        $stmt->execute([$year]);
-        $count = (int)$stmt->fetchColumn() + 1;
-        return sprintf("%d-%03d", $year, $count);
+        $stmt = $this->pdo->prepare(
+            "SELECT COALESCE(MAX(CAST(SUBSTR(identifier, 6) AS INTEGER)), 0) FROM theses WHERE identifier LIKE ?"
+        );
+        $stmt->execute([$year . '-%']);
+        $maxSeq = (int)$stmt->fetchColumn();
+        return sprintf("%d-%03d", $year, $maxSeq + 1);
     }
 
     /**
diff --git a/app/storage/posterg.db b/app/storage/posterg.db
deleted file mode 100644
index 0c5c542..0000000
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diff --git a/app/storage/test.db b/app/storage/test.db
deleted file mode 100644
index 9a05446..0000000
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