fix: resolve a core periodic minute interval bug (baserow#4912)

* Resolved a bug which caused the periodic trigger to reset its minute value if the interval was set to minute

* Lint tweak

Author: picklepete

changelog/entries/unreleased/bug/resolved_a_bug_which_caused_the_periodic_trigger_to_reset_it.json

@@ -0,0 +1,9 @@
+{
+    "type": "bug",
+    "message": "Resolved a bug which caused the periodic trigger to reset its minute value if the interval was set to minute.",
+    "issue_origin": "github",
+    "issue_number": null,
+    "domain": "automation",
+    "bullet_points": [],
+    "created_at": "2026-03-04"
+}

web-frontend/modules/integrations/core/components/services/CorePeriodicServiceForm.vue

@@ -157,6 +157,7 @@ export default {
         day_of_week: 0, // Monday=0..Sunday=6 (LOCAL)
         day_of_month: 1, // 1..31 (LOCAL)
       },
+      syncedFromValues: false, // Have we synced these from `values` yet?
     }
   },
   computed: {
@@ -259,23 +260,26 @@ export default {
     'user.day_of_week': 'syncValuesFromUser',
     'user.day_of_month': 'syncValuesFromUser',
     'values.interval'(newInterval, oldInterval) {
-      // When we change *to* MINUTE, we default to the minimum frequency
-      // that is granted to this Baserow instance type.
-      // When we change *from* MINUTE, reset minute to 0.
       if (
-        this.user.minute === 0 &&
+        this.syncedFromValues &&
         newInterval === 'MINUTE' &&
         oldInterval !== 'MINUTE'
       ) {
+        // Once `syncedFromValues` is true (which happens after the initial sync in
+        // mounted()), if the user changes the interval *to* MINUTE, we want to set the
+        // minute field to the minimum allowed frequency for this Baserow instance type.
         this.user.minute = this.minimumMinuteFrequency
       } else if (newInterval !== 'MINUTE' && oldInterval === 'MINUTE') {
+        // Otherwise if we're changing *from* MINUTE, then reset the `minute` to 0.
         this.user.minute = 0
       }
       this.syncValuesFromUser()
     },
   },
   mounted() {
     this.syncUserFromValues()
+    // We've fully synced the user facing values.
+    this.syncedFromValues = true
   },
   methods: {
     fieldHasErrors(name) {