fc3d: Settings — Download scheduling fieldset (default interval / retention / warning threshold)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/components/settings/ImportFiltersForm.vue

@@ -72,6 +72,47 @@
         </v-col>
       </v-row>
 
+      <v-divider class="my-4" />
+      <div class="text-subtitle-2 mb-2">Download scheduling (FC-3d)</div>
+      <v-row>
+        <v-col cols="12" sm="6">
+          <v-text-field
+            v-model.number="local.download_schedule_default_seconds"
+            label="Default check interval (seconds)"
+            type="number" :min="60" :max="86400"
+            density="compact" hide-details @blur="save"
+          />
+          <div class="fc-help">
+            Used when a source has no per-source or per-artist override.
+            Default 28800 (8 hours).
+          </div>
+        </v-col>
+        <v-col cols="12" sm="6">
+          <v-text-field
+            v-model.number="local.download_event_retention_days"
+            label="Event retention (days)"
+            type="number" :min="1" :max="3650"
+            density="compact" hide-details @blur="save"
+          />
+          <div class="fc-help">
+            Completed download events older than this are deleted nightly.
+            Default 90.
+          </div>
+        </v-col>
+        <v-col cols="12" sm="6">
+          <v-text-field
+            v-model.number="local.download_failure_warning_threshold"
+            label="Failure warning threshold"
+            type="number" :min="1" :max="100"
+            density="compact" hide-details @blur="save"
+          />
+          <div class="fc-help">
+            Source row badge turns red after this many consecutive
+            failures. Sources are never auto-disabled. Default 5.
+          </div>
+        </v-col>
+      </v-row>
+
       <v-alert v-if="store.settingsError" type="error" variant="tonal" class="mt-2" closable>
         {{ store.settingsError }}
       </v-alert>
@@ -94,6 +135,9 @@ const local = reactive({
   phash_threshold: 10,
   download_rate_limit_seconds: 3.0,
   download_validate_files: true,
+  download_schedule_default_seconds: 28800,
+  download_event_retention_days: 90,
+  download_failure_warning_threshold: 5,
 })
 
 watch(() => store.settings, (s) => { if (s) Object.assign(local, s) }, { immediate: true })