diff --git a/polytope_server/common/datasource/coercion.py b/polytope_server/common/datasource/coercion.py
index bf1123f..6cb73f5 100644
--- a/polytope_server/common/datasource/coercion.py
+++ b/polytope_server/common/datasource/coercion.py
@@ -9,12 +9,8 @@ class CoercionError(Exception):
 
 class Coercion:
 
-    allow_ranges = [
-        "number",
-        "step",
-        "date",
-    ]
-    allow_lists = ["class", "stream", "type", "expver", "param", "number", "date", "step"]
+    allow_ranges = ["number", "step", "date", "time"]
+    allow_lists = ["class", "stream", "type", "expver", "param", "number", "date", "step", "time"]
 
     @staticmethod
     def coerce(request: Dict[str, Any]) -> Dict[str, Any]:
@@ -198,9 +194,9 @@ def coerce_time(value: Any) -> str:
         if minute != 0:
             raise CoercionError("Invalid time format, expected HHMM or HH.")
 
-        # Format time as HHMM
-        time_str = f"{hour:02d}{minute:02d}"
-        return time_str
+        # # Format time as HHMM
+        # time_str = f"{hour:02d}{minute:02d}"
+        # return time_str
 
         # Validate hour and minute
         if not (0 <= hour <= 23):
diff --git a/polytope_server/common/datasource/polytope.py b/polytope_server/common/datasource/polytope.py
index 9050a92..4e9e5ac 100644
--- a/polytope_server/common/datasource/polytope.py
+++ b/polytope_server/common/datasource/polytope.py
@@ -211,14 +211,14 @@ def match(self, request):
         if "feature" not in r:
             raise Exception("request does not contain key 'feature'")
 
-        # Check that there is only one value if required
-        for k, v in r.items():
-            if k in self.req_single_keys:
-                v = [v] if isinstance(v, str) else v
-                if len(v) > 1:
-                    raise Exception("key '{}' cannot accept a list yet. This feature is planned.".format(k))
-                elif len(v) == 0:
-                    raise Exception("Expected a value for key {}".format(k))
+        # # Check that there is only one value if required
+        # for k, v in r.items():
+        #     if k in self.req_single_keys:
+        #         v = [v] if isinstance(v, str) else v
+        #         if len(v) > 1:
+        #             raise Exception("key '{}' cannot accept a list yet. This feature is planned.".format(k))
+        #         elif len(v) == 0:
+        #             raise Exception("Expected a value for key {}".format(k))
 
         for k, v in self.match_rules.items():
             # Check that all required keys exist
diff --git a/skaffold.yaml b/skaffold.yaml
index 6a41b37..8f98b2c 100644
--- a/skaffold.yaml
+++ b/skaffold.yaml
@@ -1,4 +1,3 @@
-
 apiVersion: skaffold/v4beta10
 kind: Config
 
@@ -18,8 +17,15 @@ build:
     concurrency: 1
 
   tagPolicy:
-    gitCommit:
-      ignoreChanges: true
+    customTemplate:
+      template: "{{.PREFIX}}{{.GIT_TAG}}"
+      components:
+      - name: PREFIX
+        envTemplate:
+          template: '{{default "" .PREFIX}}'
+      - name: GIT_TAG
+        gitCommit:
+          ignoreChanges: true
 
   artifacts:
   
@@ -28,19 +34,19 @@ build:
     docker:
       target: polytope-common
       buildArgs:
-        developer_mode: "{{ .developer_mode }}"
+        developer_mode: '{{ default "false" .developer_mode }}'
 
   # Worker with all clients (FDB, GribJump, MARS C, MARS CPP)
   - image: "worker"
     docker:
       target: worker
       buildArgs:
-        rpm_repo: "{{ .rpm_repo }}"
-        mars_config_repo: "{{ .mars_config_repo }}"
-        mars_config_branch: "{{ .mars_config_branch }}"
-        developer_mode: "{{ .developer_mode }}"
+        rpm_repo: '{{ .rpm_repo }}'
+        mars_config_repo: '{{ .mars_config_repo }}'
+        mars_config_branch: '{{ .mars_config_branch }}'
+        developer_mode: '{{ .developer_mode }}'
         # mars_client_c_version: 6.33.20.2
-        gribjump_version: 0.8.0
+        gribjump_version: '{{ default "0.8.0" .gribjump_version }}'
         # mars_client_cpp_version: 6.99.3.0
         # ecbuild_version: 3.8.2
         # eccodes_version: 2.33.1