diff --git a/backend/src/Shared/Infrastructure/Persistence/Doctrine/TenantAwareConnection.php b/backend/src/Shared/Infrastructure/Persistence/Doctrine/TenantAwareConnection.php
index 4829bf8..7645252 100644
--- a/backend/src/Shared/Infrastructure/Persistence/Doctrine/TenantAwareConnection.php
+++ b/backend/src/Shared/Infrastructure/Persistence/Doctrine/TenantAwareConnection.php
@@ -73,6 +73,13 @@ final class TenantAwareConnection extends Connection implements TenantDatabaseSw
         /** @phpstan-var Params $connectionParams */
         $connectionParams = array_merge($this->defaultConnectionParams, $this->dsnParser->parse($databaseUrl));
 
+        // Preserve dbname_suffix from Doctrine config (e.g. '_test' in test env)
+        // so that tenant connections target the same database as the default one.
+        $suffix = $this->defaultConnectionParams['dbname_suffix'] ?? null;
+        if (is_string($suffix) && isset($connectionParams['dbname']) && is_string($connectionParams['dbname'])) {
+            $connectionParams['dbname'] .= $suffix;
+        }
+
         $this->applyConnectionParams($connectionParams, $databaseUrl);
     }