fix(config): auto-route test.db locally, posterg.db on production

- config.php: getDatabasePath() detects php built-in CLI server
  (php_sapi_name() === 'cli-server') and routes to test.db; all
  other SAPIs (nginx/fpm) get posterg.db. DB_ENV env-var still
  overrides either way.

- migrate.sh: auto-initialise the target DB from storage/schema.sql
  when the file is absent or has no tables yet. Existing DBs with
  data are left completely untouched (table_count check, no re-run
  of schema on populated DB). Idempotent: safe to run repeatedly.

- justfile: serve still calls migrate (which now handles init too),
  no DB_ENV prefix needed since sapi detection handles routing.

TODO.md

@@ -6,3 +6,5 @@
 - [x] Fix wrong `require_once` depth in `public/admin/actions/page.php` (`../../` → `../../../`)
 - [x] Fix same path depth bug in `formulaire.php` and `publish.php`
 - [x] Fix CSV import: imported theses not visible on public site (is_published defaulted to 0, access_type_id never set)
+- [x] Fix DB routing: local dev (php -S) auto-uses test.db, production (nginx/fpm) uses posterg.db — no env var needed
+- [x] migrate.sh auto-initialises DB from schema when absent/empty; existing DBs untouched

scripts/migrate.sh

@@ -63,9 +63,13 @@ migrate_db() {
     local db="$1"
     local label="$2"
 
-    if [ ! -f "$db" ]; then
-        echo "  [$label] database not found, skipping: $db"
-        return
+    # Auto-create from schema only when the file is absent or truly empty (no tables)
+    local table_count
+    table_count=$(sqlite3 "$db" "SELECT COUNT(*) FROM sqlite_master WHERE type='table';" 2>/dev/null || echo 0)
+    if [ "$table_count" -eq 0 ]; then
+        echo "  [$label] initialising from schema…"
+        sqlite3 "$db" < "$REPO_ROOT/storage/schema.sql"
+        echo "  [$label] schema applied."
     fi
 
     # Ensure tracking table exists

src/config.php

@@ -8,27 +8,33 @@
 // Database paths relative to repository root
 define('DB_ROOT', __DIR__ . '/..');
 
-// Test database (used in development)
+// Local dev database (php -S, never committed)
 define('DB_TEST_PATH', DB_ROOT . '/storage/test.db');
 
-// Production database (used on server)
+// Production database (nginx/php-fpm on server)
 define('DB_PROD_PATH', DB_ROOT . '/storage/posterg.db');
 
 /**
  * Determine which database to use.
  *
- * Always defaults to the production database.
- * Set DB_ENV=test explicitly to use the test database.
+ * - php built-in server (php -S …)  → storage/test.db   (local dev)
+ * - everything else (nginx/fpm)     → storage/posterg.db (production)
  *
- *   export DB_ENV=test   # use storage/test.db
- *   export DB_ENV=prod   # use storage/posterg.db (default)
- *
- * The old file-existence auto-detection has been removed: a leftover
- * test.db on a developer machine no longer silently redirects all
- * requests to test data.
+ * The DB_ENV env-var can still override either way:
+ *   DB_ENV=test  → force test.db
+ *   DB_ENV=prod  → force posterg.db
  */
 function getDatabasePath(): string {
-    if (getenv('DB_ENV') === 'test') {
+    $env = getenv('DB_ENV');
+    if ($env === 'test') {
+        return DB_TEST_PATH;
+    }
+    if ($env === 'prod') {
+        return DB_PROD_PATH;
+    }
+
+    // Auto-detect: php built-in CLI server == local development
+    if (php_sapi_name() === 'cli-server') {
         return DB_TEST_PATH;
     }
 
@@ -36,8 +42,8 @@ function getDatabasePath(): string {
 }
 
 /**
- * Check if running in test/development mode
+ * Check if running in local dev mode
  */
-function isTestMode() {
+function isTestMode(): bool {
     return getDatabasePath() === DB_TEST_PATH;
 }