diff --git a/ui/src/app/shared/autocomplete/autocomplete.component.ts b/ui/src/app/shared/autocomplete/autocomplete.component.ts
index bbe92dfa7..9f2ebb52a 100644
--- a/ui/src/app/shared/autocomplete/autocomplete.component.ts
+++ b/ui/src/app/shared/autocomplete/autocomplete.component.ts
@@ -212,12 +212,14 @@ export class AutoCompleteComponent implements OnInit, OnDestroy, OnChanges, Afte
 
     handleInputChange(query: string): void {
         query = query || '';
+
         const queryEmpty = query.length === 0;
         const autoselect = this.hasAutoselect;
         const optionsAvailable = this.matches.length > 0;
         const searchForOptions = !queryEmpty;
+        const focused = this.state.currentState.focused !== null;
         this.state.setState({
-            menuOpen: searchForOptions && !this.matches.some(m => m === query),
+            menuOpen: searchForOptions && (focused && !this.matches.some(m => m === query)),
             selected: searchForOptions ? ((autoselect && optionsAvailable) ? 0 : -1) : null
         });
         this.propagateChange(query);
diff --git a/ui/src/assets/schema/provider/filebacked-http-advanced.schema.json b/ui/src/assets/schema/provider/filebacked-http-advanced.schema.json
index a272f7771..fc79a9481 100644
--- a/ui/src/assets/schema/provider/filebacked-http-advanced.schema.json
+++ b/ui/src/assets/schema/provider/filebacked-http-advanced.schema.json
@@ -80,7 +80,8 @@
                             "PT24H"
                         ]
                     },
-                    "default": ""
+                    "default": null,
+                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "connectionTimeout": {
                     "type": "string",
@@ -101,7 +102,8 @@
                             "PT24H"
                         ]
                     },
-                    "default": ""
+                    "default": null,
+                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "socketTimeout": {
                     "type": "string",
@@ -122,7 +124,8 @@
                             "PT24H"
                         ]
                     },
-                    "default": ""
+                    "default": null,
+                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "disregardTLSCertificate": {
                     "type": "boolean",
diff --git a/ui/src/assets/schema/provider/filebacked-http-filters.schema.json b/ui/src/assets/schema/provider/filebacked-http-filters.schema.json
index 2eecb1ec4..0def9721c 100644
--- a/ui/src/assets/schema/provider/filebacked-http-filters.schema.json
+++ b/ui/src/assets/schema/provider/filebacked-http-filters.schema.json
@@ -16,9 +16,24 @@
                         "maxValidityInterval": {
                             "title": "Max Validity Interval",
                             "description": "Defines the window within which the metadata is valid.",
-                            "type": "number",
-                            "minimum": 0,
-                            "default": 0
+                            "type": "string",
+                            "placeholder": "Duration",
+                            "widget": {
+                                "id": "datalist",
+                                "data": [
+                                    "PT0S",
+                                    "PT30S",
+                                    "PT1M",
+                                    "PT10M",
+                                    "PT30M",
+                                    "PT1H",
+                                    "PT4H",
+                                    "PT12H",
+                                    "PT24H"
+                                ]
+                            },
+                            "default": null,
+                            "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                         }
                     }
                 },
diff --git a/ui/src/assets/schema/provider/filebacked-http-reloading.schema.json b/ui/src/assets/schema/provider/filebacked-http-reloading.schema.json
index bba9e57b5..e1c2ab5b7 100644
--- a/ui/src/assets/schema/provider/filebacked-http-reloading.schema.json
+++ b/ui/src/assets/schema/provider/filebacked-http-reloading.schema.json
@@ -23,7 +23,8 @@
                             "PT24H"
                         ]
                     },
-                    "default": ""
+                    "default": null,
+                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "maxRefreshDelay": {
                     "title": "Max Refresh Delay",
@@ -44,7 +45,8 @@
                             "PT24H"
                         ]
                     },
-                    "default": ""
+                    "default": null,
+                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "refreshDelayFactor": {
                     "title": "Refresh Delay Factor",
@@ -101,7 +103,8 @@
                             "PT24H"
                         ]
                     },
-                    "default": ""
+                    "default": null,
+                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 }
             }
         }