diff --git a/includes/class-admin-page.php b/includes/class-admin-page.php
index 1cac891..64fa7de 100644
--- a/includes/class-admin-page.php
+++ b/includes/class-admin-page.php
@@ -62,7 +62,6 @@ class Thalim_NL_Admin_Page {
             'meta_key'       => '_newsletter_month',
             'orderby'        => 'meta_value',
             'order'          => 'DESC',
-            'lang'           => '',
         ]);
         $past_newsletters = array_filter($past_newsletters, function ($p) {
             return !empty(get_post_meta($p->ID, '_newsletter_month', true));
@@ -490,15 +489,40 @@ class Thalim_NL_Admin_Page {
 
         $this->do_triple_storage_category($post_id, THALIM_NL_CAT_NEWSLETTER);
 
-        if (function_exists('pll_set_post_language')) {
-            pll_set_post_language($post_id, 'fr');
-        }
-
         return $post_id;
     }
 
     /**
-     * Assign a category using the Pods triple-storage pattern (same as HAL importer).
+     * Résout l'ID du pod `post` et celui de son champ `categorie` par NOM
+     * dans wp_posts (post_type _pods_pod / _pods_field) — les IDs en dur ne
+     * survivent pas à une réimportation de base.
+     *
+     * @return array{0:int,1:int} [pod_id, field_id] (0 si introuvable)
+     */
+    private function resolve_pods_categorie_ids(): array {
+        static $ids = null;
+        if ($ids === null) {
+            global $wpdb;
+            $pod_id = (int) $wpdb->get_var(
+                "SELECT ID FROM {$wpdb->posts}
+                 WHERE post_type = '_pods_pod' AND post_name = 'post' LIMIT 1"
+            );
+            $field_id = $pod_id ? (int) $wpdb->get_var($wpdb->prepare(
+                "SELECT ID FROM {$wpdb->posts}
+                 WHERE post_type = '_pods_field' AND post_name = 'categorie' AND post_parent = %d
+                 LIMIT 1",
+                $pod_id
+            )) : 0;
+            $ids = [$pod_id, $field_id];
+        }
+        return $ids;
+    }
+
+    /**
+     * Assign a category using the Pods quadruple-storage pattern (same as HAL importer).
+     *
+     * ⚠ DÉPENDANCE DURE à Pods 3.x : reproduit le stockage interne de Pods
+     * (postmeta + _pods_* sérialisé + wp_podsrel + catégorie WP native).
      */
     private function do_triple_storage_category(int $post_id, int $cat_id): void {
         global $wpdb;
@@ -513,11 +537,19 @@ class Thalim_NL_Admin_Page {
         update_post_meta($post_id, '_pods_categorie', [$cat_id]);
 
         // 4. wp_podsrel row
+        [$pod_id, $field_id] = $this->resolve_pods_categorie_ids();
+        if (!$pod_id || !$field_id) {
+            error_log(sprintf(
+                '[thalim-newsletter] Pod/champ Pods "categorie" introuvable — wp_podsrel non écrit pour le post %d',
+                $post_id
+            ));
+            return;
+        }
         $wpdb->delete(
             $wpdb->prefix . 'podsrel',
             [
-                'pod_id'   => THALIM_NL_POD_ID_POST,
-                'field_id' => THALIM_NL_FIELD_ID_CAT,
+                'pod_id'   => $pod_id,
+                'field_id' => $field_id,
                 'item_id'  => $post_id,
             ],
             ['%d', '%d', '%d']
@@ -525,8 +557,8 @@ class Thalim_NL_Admin_Page {
         $wpdb->insert(
             $wpdb->prefix . 'podsrel',
             [
-                'pod_id'           => THALIM_NL_POD_ID_POST,
-                'field_id'         => THALIM_NL_FIELD_ID_CAT,
+                'pod_id'           => $pod_id,
+                'field_id'         => $field_id,
                 'item_id'          => $post_id,
                 'related_pod_id'   => 0,
                 'related_field_id' => 0,
@@ -617,7 +649,6 @@ class Thalim_NL_Admin_Page {
             'posts_per_page' => 1,
             'meta_key'       => '_newsletter_month',
             'meta_value'     => $year_month,
-            'lang'           => '', // Polylang: all languages
         ]);
         return $posts[0] ?? null;
     }
diff --git a/includes/class-post-query.php b/includes/class-post-query.php
index 0549884..1add71c 100644
--- a/includes/class-post-query.php
+++ b/includes/class-post-query.php
@@ -37,13 +37,27 @@ class Thalim_NL_Post_Query {
      */
     private const SEANCE_WINDOW_MARGIN_DAYS = 5;
 
-    /** Categories to exclude from the newsletter UI */
-    private const EXCLUDED_CATS = [
-        9,  // Vie du labo (intranet)
-        12, // Séance de séminaire
-        20, // Newsletter
-        31, // Non classé
-    ];
+    /**
+     * Categories to exclude from the newsletter UI, résolues par slug
+     * (fallback sur les IDs historiques si un slug est introuvable).
+     */
+    private static function excluded_cats(): array {
+        static $ids = null;
+        if ($ids === null) {
+            $map = [
+                'vie-du-labo-intranet' => 9,  // Vie du labo (intranet)
+                'seance-de-seminaire'  => 12, // Séance de séminaire
+                'newsletter'           => 20, // Newsletter
+                'non-classe'           => 31, // Non classé
+            ];
+            $ids = [];
+            foreach ($map as $slug => $fallback) {
+                $term  = get_term_by('slug', $slug, 'category');
+                $ids[] = $term ? (int) $term->term_id : $fallback;
+            }
+        }
+        return $ids;
+    }
 
     /**
      * Get all newsletter-eligible categories, grouped by parent.
@@ -61,7 +75,7 @@ class Thalim_NL_Post_Query {
         $parents   = [];
 
         foreach ($all_cats as $cat) {
-            if (in_array($cat->term_id, self::EXCLUDED_CATS, true)) {
+            if (in_array($cat->term_id, self::excluded_cats(), true)) {
                 continue;
             }
             if ($cat->parent == 0) {
@@ -74,7 +88,7 @@ class Thalim_NL_Post_Query {
         }
 
         foreach ($all_cats as $cat) {
-            if (in_array($cat->term_id, self::EXCLUDED_CATS, true)) {
+            if (in_array($cat->term_id, self::excluded_cats(), true)) {
                 continue;
             }
             if ($cat->parent == 0) {
diff --git a/phpcs.xml.dist b/phpcs.xml.dist
new file mode 100644
index 0000000..1dfe150
--- /dev/null
+++ b/phpcs.xml.dist
@@ -0,0 +1,17 @@
+<?xml version="1.0"?>
+<ruleset name="THALIM thalim-newsletter">
+    <description>WordPress Coding Standards pour thalim-newsletter.</description>
+    <!-- Installation : composer global require wp-coding-standards/wpcs dealerdirect/phpcodesniffer-composer-installer
+         Exécution depuis ce dossier : phpcs -->
+    <file>.</file>
+    <exclude-pattern>tests/*</exclude-pattern>
+    <arg name="extensions" value="php"/>
+    <arg value="sp"/>
+    <rule ref="WordPress-Core">
+        <exclude name="Universal.Arrays.DisallowShortArraySyntax"/>
+        <exclude name="WordPress.WhiteSpace.PrecisionAlignment"/>
+        <exclude name="Generic.WhiteSpace.DisallowSpaceIndent"/>
+    </rule>
+    <rule ref="WordPress.Security"/>
+    <rule ref="WordPress.DB.PreparedSQL"/>
+</ruleset>
diff --git a/tests/run-tests.php b/tests/run-tests.php
new file mode 100644
index 0000000..6578e84
--- /dev/null
+++ b/tests/run-tests.php
@@ -0,0 +1,67 @@
+<?php
+/**
+ * Tests du plugin THALIM Newsletter.
+ *
+ * Exécution (environnement Docker de dev) :
+ *   docker exec wordpress php /var/www/html/wp-content/plugins/thalim-newsletter/tests/run-tests.php
+ */
+
+if (PHP_SAPI !== 'cli') {
+    exit("CLI only\n");
+}
+
+$_SERVER['HTTP_HOST']   = $_SERVER['HTTP_HOST'] ?? 'localhost';
+$_SERVER['REQUEST_URI'] = $_SERVER['REQUEST_URI'] ?? '/';
+
+require dirname(__DIR__, 4) . '/wp-load.php';
+
+$failures = 0;
+$count    = 0;
+
+function check(string $name, $actual, $expected): void {
+    global $failures, $count;
+    $count++;
+    if ($actual === $expected) {
+        echo "  ok    $name\n";
+    } else {
+        $failures++;
+        echo "  FAIL  $name\n        attendu: " . var_export($expected, true)
+           . "\n        obtenu : " . var_export($actual, true) . "\n";
+    }
+}
+
+echo "== constantes de catégories (résolution par slug) ==\n";
+check('APPELS = 8',       THALIM_NL_CAT_APPELS, 8);
+check('COLLOQUES = 10',   THALIM_NL_CAT_COLLOQUES, 10);
+check('SEMINAIRES = 11',  THALIM_NL_CAT_SEMINAIRES, 11);
+check('COMMS = 13',       THALIM_NL_CAT_COMMS, 13);
+check('SOUTENANCES = 14', THALIM_NL_CAT_SOUTENANCES, 14);
+check('OUVRAGES = 15',    THALIM_NL_CAT_OUVRAGES, 15);
+check('ARTICLES = 16',    THALIM_NL_CAT_ARTICLES, 16);
+check('NEWSLETTER = 20',  THALIM_NL_CAT_NEWSLETTER, 20);
+
+echo "== fenêtres de dates par catégorie ==\n";
+check('appels → datetime_to_fin',         Thalim_NL_Post_Query::get_window_type(THALIM_NL_CAT_APPELS), 'datetime_to_fin');
+check('colloques → debut_minus35_to_fin', Thalim_NL_Post_Query::get_window_type(THALIM_NL_CAT_COLLOQUES), 'debut_minus35_to_fin');
+check('comms → debut_minus35_to_fin',     Thalim_NL_Post_Query::get_window_type(THALIM_NL_CAT_COMMS), 'debut_minus35_to_fin');
+check('soutenances → datetime_to_fin',    Thalim_NL_Post_Query::get_window_type(THALIM_NL_CAT_SOUTENANCES), 'datetime_to_fin');
+check('ouvrages → datetime_plus3m',       Thalim_NL_Post_Query::get_window_type(THALIM_NL_CAT_OUVRAGES), 'datetime_plus3m');
+check('articles → datetime_plus3m',       Thalim_NL_Post_Query::get_window_type(THALIM_NL_CAT_ARTICLES), 'datetime_plus3m');
+check('autre cat → datetime_plus35d',     Thalim_NL_Post_Query::get_window_type(99999), 'datetime_plus35d');
+
+echo "== catégories éligibles ==\n";
+$eligible = Thalim_NL_Post_Query::get_all_eligible_cat_ids();
+check('exclut séances (12)',    in_array(12, $eligible, true), false);
+check('exclut vie du labo (9)', in_array(9, $eligible, true), false);
+check('exclut newsletter (20)', in_array(20, $eligible, true), false);
+check('exclut non classé (31)', in_array(31, $eligible, true), false);
+check('inclut séminaires (11)', in_array(11, $eligible, true), true);
+
+echo "== get_posts_for_month (sanity) ==\n";
+$q = new Thalim_NL_Post_Query();
+check('mois invalide → []', $q->get_posts_for_month('garbage'), []);
+$month = $q->get_posts_for_month(date('Y-m'));
+check('mois courant → array', is_array($month), true);
+
+echo "\n$count tests, $failures échec(s)\n";
+exit($failures ? 1 : 0);
diff --git a/thalim-newsletter.php b/thalim-newsletter.php
index 15db785..5b998d1 100644
--- a/thalim-newsletter.php
+++ b/thalim-newsletter.php
@@ -19,19 +19,42 @@ define('THALIM_NL_VERSION',    '1.0.0');
 define('THALIM_NL_PLUGIN_DIR', plugin_dir_path(__FILE__));
 define('THALIM_NL_PLUGIN_URL', plugin_dir_url(__FILE__));
 
-// Category IDs (verified in DB 2026-03-20)
-define('THALIM_NL_CAT_APPELS',       8);
-define('THALIM_NL_CAT_COLLOQUES',   10);
-define('THALIM_NL_CAT_SEMINAIRES',  11);
-define('THALIM_NL_CAT_COMMS',       13);
-define('THALIM_NL_CAT_SOUTENANCES', 14);
-define('THALIM_NL_CAT_OUVRAGES',    15);
-define('THALIM_NL_CAT_ARTICLES',    16);
-define('THALIM_NL_CAT_NEWSLETTER',  20);
-
-// Pods IDs (verified in DB 2026-03-20)
-define('THALIM_NL_POD_ID_POST',   8);
-define('THALIM_NL_FIELD_ID_CAT', 16);
+// Catégories : résolues par slug au chargement (les term_ids auto-incrémentés
+// ne survivent pas à une réimportation de base). Fallback sur les IDs
+// historiques (vérifiés en base 2026-03-20) si un slug est introuvable.
+// Une seule requête SQL, mise en cache 1 jour (transient).
+(function () {
+    $cats = [
+        'THALIM_NL_CAT_APPELS'      => ['appels-a-contribution',          8],
+        'THALIM_NL_CAT_COLLOQUES'   => ['colloques-et-journees-detudes', 10],
+        'THALIM_NL_CAT_SEMINAIRES'  => ['seminaires',                    11],
+        'THALIM_NL_CAT_COMMS'       => ['communications',                13],
+        'THALIM_NL_CAT_SOUTENANCES' => ['soutenances',                   14],
+        'THALIM_NL_CAT_OUVRAGES'    => ['ouvrages',                      15],
+        'THALIM_NL_CAT_ARTICLES'    => ['articles',                      16],
+        'THALIM_NL_CAT_NEWSLETTER'  => ['newsletter',                    20],
+    ];
+    $by_slug = get_transient('thalim_nl_cat_ids');
+    if (!is_array($by_slug)) {
+        global $wpdb;
+        $slugs        = array_column($cats, 0);
+        $placeholders = implode(',', array_fill(0, count($slugs), '%s'));
+        $rows = $wpdb->get_results($wpdb->prepare(
+            "SELECT t.slug, t.term_id FROM {$wpdb->terms} t
+             JOIN {$wpdb->term_taxonomy} tt ON tt.term_id = t.term_id
+             WHERE tt.taxonomy = 'category' AND t.slug IN ($placeholders)",
+            $slugs
+        ));
+        $by_slug = [];
+        foreach ((array) $rows as $row) {
+            $by_slug[$row->slug] = (int) $row->term_id;
+        }
+        set_transient('thalim_nl_cat_ids', $by_slug, DAY_IN_SECONDS);
+    }
+    foreach ($cats as $const => [$slug, $fallback]) {
+        define($const, $by_slug[$slug] ?? $fallback);
+    }
+})();
 
 /**
  * Main plugin class — singleton