diff --git a/ui-ngx/src/app/modules/home/components/calculated-fields/components/entity-aggregation-configuration/entity-aggregation-component.component.html b/ui-ngx/src/app/modules/home/components/calculated-fields/components/entity-aggregation-configuration/entity-aggregation-component.component.html
index 84dcb23d4c..5114a4cdc1 100644
--- a/ui-ngx/src/app/modules/home/components/calculated-fields/components/entity-aggregation-configuration/entity-aggregation-component.component.html
+++ b/ui-ngx/src/app/modules/home/components/calculated-fields/components/entity-aggregation-configuration/entity-aggregation-component.component.html
@@ -62,30 +62,32 @@
       </div>
       @if (entityAggregationConfiguration.get('interval.type').value === AggIntervalType.CUSTOM) {
         <tb-time-unit-input required
-                            [minTime]="0"
+                            [minTime]="60"
                             sameWidthInputs
                             appearance="outline"
                             subscriptSizing="dynamic"
                             labelText="{{ 'calculated-fields.aggregate-interval-value' | translate }}"
+                            minErrorText="{{ 'calculated-fields.aggregate-interval-value-min' | translate }}"
                             requiredText="{{ 'calculated-fields.aggregate-interval-value-required' | translate }}"
-                            formControlName="multiplier">
+                            formControlName="durationSec">
         </tb-time-unit-input>
       }
       <div class="tb-form-panel stroked">
-        <mat-slide-toggle class="mat-slide flex" formControlName="allowOffsetMillis">
+        <mat-slide-toggle class="mat-slide flex" formControlName="allowOffsetSec">
           <div tb-hint-tooltip-icon="{{ 'calculated-fields.entity-aggregation.apply-offset-hint' | translate }}">
             {{ 'calculated-fields.entity-aggregation.apply-offset' | translate }}
           </div>
         </mat-slide-toggle>
-        @if (entityAggregationConfiguration.get('interval.allowOffsetMillis').value) {
+        @if (entityAggregationConfiguration.get('interval.allowOffsetSec').value) {
           <tb-time-unit-input required
-                              [minTime]="1"
+                              [minTime]="0"
                               sameWidthInputs
                               appearance="outline"
                               subscriptSizing="dynamic"
                               labelText="{{ 'calculated-fields.entity-aggregation.offset-value' | translate }}"
+                              minErrorText="{{ 'calculated-fields.entity-aggregation.offset-value-min' | translate }}"
                               requiredText="{{ 'calculated-fields.entity-aggregation.offset-value-required' | translate }}"
-                              formControlName="offsetMillis">
+                              formControlName="offsetSec">
           </tb-time-unit-input>
         }
       </div>
@@ -99,21 +101,23 @@
       @if (entityAggregationConfiguration.get('allowWatermark').value) {
         <ng-container formGroupName="watermark">
           <tb-time-unit-input required
-                              [minTime]="1"
+                              [minTime]="60"
                               sameWidthInputs
                               appearance="outline"
-                              labelText="{{ 'calculated-fields.entity-aggregation.wait-duration' | translate }}"
-                              hintText="{{ 'calculated-fields.entity-aggregation.wait-duration-hint' | translate }}"
-                              requiredText="{{ 'calculated-fields.entity-aggregation.wait-duration-required' | translate }}"
+                              labelText="{{ 'calculated-fields.entity-aggregation.duration' | translate }}"
+                              minErrorText="{{ 'calculated-fields.entity-aggregation.duration-min' | translate }}"
+                              hintText="{{ 'calculated-fields.entity-aggregation.duration-hint' | translate }}"
+                              requiredText="{{ 'calculated-fields.entity-aggregation.duration-required' | translate }}"
                               formControlName="duration">
           </tb-time-unit-input>
           <tb-time-unit-input required
-                              [minTime]="0"
+                              [minTime]="30"
                               [maxTime]="entityAggregationConfiguration.get('watermark.duration').value"
                               sameWidthInputs
                               appearance="outline"
                               labelText="{{ 'calculated-fields.entity-aggregation.check-interval' | translate }}"
                               hintText="{{ 'calculated-fields.entity-aggregation.check-interval-hint' | translate }}"
+                              minErrorText="{{ 'calculated-fields.entity-aggregation.check-interval-min' | translate }}"
                               maxErrorText="{{ 'calculated-fields.entity-aggregation.check-interval-max' | translate }}"
                               requiredText="{{ 'calculated-fields.entity-aggregation.check-interval-required' | translate }}"
                               formControlName="checkInterval">
diff --git a/ui-ngx/src/app/modules/home/components/calculated-fields/components/entity-aggregation-configuration/entity-aggregation-component.component.ts b/ui-ngx/src/app/modules/home/components/calculated-fields/components/entity-aggregation-configuration/entity-aggregation-component.component.ts
index 9f48187b55..5fd958518b 100644
--- a/ui-ngx/src/app/modules/home/components/calculated-fields/components/entity-aggregation-configuration/entity-aggregation-component.component.ts
+++ b/ui-ngx/src/app/modules/home/components/calculated-fields/components/entity-aggregation-configuration/entity-aggregation-component.component.ts
@@ -41,7 +41,7 @@ import { HOUR, MINUTE, SECOND } from '@shared/models/time/time.models';
 import { isDefinedAndNotNull } from '@core/utils';
 
 interface CalculatedFieldEntityAggregationConfigurationValue extends CalculatedFieldEntityAggregationConfiguration {
-  interval: AggInterval & {allowOffsetMillis?: boolean};
+  interval: AggInterval & {allowOffsetSec?: boolean};
   allowWatermark: boolean;
 }
 
@@ -79,14 +79,14 @@ export class EntityAggregationComponentComponent implements ControlValueAccessor
     interval: this.fb.group({
       type: [AggIntervalType.HOUR],
       tz: ['', Validators.required],
-      multiplier: [HOUR/SECOND, Validators.required],
-      allowOffsetMillis: [false],
-      offsetMillis: [MINUTE/SECOND, Validators.required],
+      durationSec: [HOUR/SECOND, Validators.required],
+      allowOffsetSec: [false],
+      offsetSec: [MINUTE/SECOND, Validators.required],
     }),
     allowWatermark: [false],
     watermark: this.fb.group({
-      duration: [6 * MINUTE / SECOND, Validators.required],
-      checkInterval: [MINUTE / SECOND, Validators.required],
+      duration: [HOUR/SECOND, Validators.required],
+      checkInterval: [10 * MINUTE / SECOND, Validators.required],
     }),
     output: this.fb.control<CalculatedFieldOutput>({
       type: OutputType.Timeseries,
@@ -111,7 +111,7 @@ export class EntityAggregationComponentComponent implements ControlValueAccessor
       this.checkAggIntervalType(type);
     });
 
-    this.entityAggregationConfiguration.get('interval.allowOffsetMillis').valueChanges.pipe(
+    this.entityAggregationConfiguration.get('interval.allowOffsetSec').valueChanges.pipe(
       takeUntilDestroyed()
     ).subscribe((allow: boolean) => {
       this.checkIntervalDuration(allow);
@@ -138,11 +138,11 @@ export class EntityAggregationComponentComponent implements ControlValueAccessor
     const data: CalculatedFieldEntityAggregationConfigurationValue = {
       ...value,
       allowWatermark: isDefinedAndNotNull(value.watermark),
-      interval: {...value.interval, allowOffsetMillis: isDefinedAndNotNull(value?.interval?.offsetMillis)}
+      interval: {...value.interval, allowOffsetSec: isDefinedAndNotNull(value?.interval?.offsetSec)}
     }
     this.entityAggregationConfiguration.patchValue(data, {emitEvent: false});
     this.checkAggIntervalType(this.entityAggregationConfiguration.get('interval.type').value);
-    this.checkIntervalDuration(this.entityAggregationConfiguration.get('interval.allowOffsetMillis').value);
+    this.checkIntervalDuration(this.entityAggregationConfiguration.get('interval.allowOffsetSec').value);
     this.checkWatermark(this.entityAggregationConfiguration.get('allowWatermark').value);
     setTimeout(() => {
       this.entityAggregationConfiguration.get('arguments').updateValueAndValidity({onlySelf: true});
@@ -161,17 +161,17 @@ export class EntityAggregationComponentComponent implements ControlValueAccessor
     } else {
       this.entityAggregationConfiguration.enable({emitEvent: false});
       this.checkAggIntervalType(this.entityAggregationConfiguration.get('interval.type').value);
-      this.checkIntervalDuration(this.entityAggregationConfiguration.get('interval.allowOffsetMillis').value);
+      this.checkIntervalDuration(this.entityAggregationConfiguration.get('interval.allowOffsetSec').value);
       this.checkWatermark(this.entityAggregationConfiguration.get('allowWatermark').value);
     }
   }
 
   private updatedModel(value: CalculatedFieldEntityAggregationConfigurationValue): void {
     value.type = CalculatedFieldType.ENTITY_AGGREGATION;
-    if (!value.interval.allowOffsetMillis) {
-      delete value.interval.offsetMillis;
+    if (!value.interval.allowOffsetSec) {
+      delete value.interval.offsetSec;
     }
-    delete value.interval.offsetMillis;
+    delete value.interval.offsetSec;
     if (!value.allowWatermark) {
       delete value.watermark;
     }
@@ -181,17 +181,17 @@ export class EntityAggregationComponentComponent implements ControlValueAccessor
 
   private checkAggIntervalType(type: AggIntervalType) {
     if (type === AggIntervalType.CUSTOM) {
-      this.entityAggregationConfiguration.get('interval.multiplier').enable({emitEvent: false});
+      this.entityAggregationConfiguration.get('interval.durationSec').enable({emitEvent: false});
     } else {
-      this.entityAggregationConfiguration.get('interval.multiplier').disable({emitEvent: false});
+      this.entityAggregationConfiguration.get('interval.durationSec').disable({emitEvent: false});
     }
   }
 
   private checkIntervalDuration(allow: boolean) {
     if (allow) {
-      this.entityAggregationConfiguration.get('interval.offsetMillis').enable({emitEvent: false});
+      this.entityAggregationConfiguration.get('interval.offsetSec').enable({emitEvent: false});
     } else {
-      this.entityAggregationConfiguration.get('interval.offsetMillis').disable({emitEvent: false});
+      this.entityAggregationConfiguration.get('interval.offsetSec').disable({emitEvent: false});
     }
   }
 
diff --git a/ui-ngx/src/app/modules/home/components/calculated-fields/components/metrics/calculated-field-metrics-panel.component.html b/ui-ngx/src/app/modules/home/components/calculated-fields/components/metrics/calculated-field-metrics-panel.component.html
index d57a487dbd..eda8a779ad 100644
--- a/ui-ngx/src/app/modules/home/components/calculated-fields/components/metrics/calculated-field-metrics-panel.component.html
+++ b/ui-ngx/src/app/modules/home/components/calculated-fields/components/metrics/calculated-field-metrics-panel.component.html
@@ -160,6 +160,14 @@
         </tb-js-func>
       }
     </ng-container>
+    @if (simpleMode) {
+      <div class="tb-form-row">
+        <div class="fixed-title-width">{{ 'calculated-fields.default-value' | translate }}</div>
+        <mat-form-field class="flex-1" appearance="outline" subscriptSizing="dynamic">
+          <input matInput autocomplete="off" type="number" name="value" formControlName="defaultValue" placeholder="{{ 'action.set' | translate }}"/>
+        </mat-form-field>
+      </div>
+    }
   </div>
   <div class="tb-config-panel-buttons">
     <button mat-button
diff --git a/ui-ngx/src/app/modules/home/components/calculated-fields/components/metrics/calculated-field-metrics-panel.component.ts b/ui-ngx/src/app/modules/home/components/calculated-fields/components/metrics/calculated-field-metrics-panel.component.ts
index b06a49d60d..4a843208c5 100644
--- a/ui-ngx/src/app/modules/home/components/calculated-fields/components/metrics/calculated-field-metrics-panel.component.ts
+++ b/ui-ngx/src/app/modules/home/components/calculated-fields/components/metrics/calculated-field-metrics-panel.component.ts
@@ -16,14 +16,17 @@
 
 import { Component, Input, OnInit, output } from '@angular/core';
 import { TbPopoverComponent } from '@shared/components/popover.component';
-import { FormBuilder, FormControl, ValidatorFn, Validators } from '@angular/forms';
+import { FormBuilder, Validators } from '@angular/forms';
 import { charsWithNumRegex } from '@shared/models/regex.constants';
 import {
   AggFunction,
   AggFunctionTranslations,
   AggInputType,
   AggInputTypeTranslations,
-  CalculatedFieldAggMetricValue
+  CalculatedFieldAggMetricValue,
+  FORBIDDEN_NAMES,
+  forbiddenNamesValidator,
+  uniqueNameValidator
 } from '@shared/models/calculated-field.models';
 import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
 import { EntityFilter } from '@shared/models/query/query.models';
@@ -55,7 +58,7 @@ export class CalculatedFieldMetricsPanelComponent implements OnInit {
   functionArgs: Array<string>
 
   metricForm = this.fb.group({
-    name: ['', [Validators.required, this.uniqNameRequired(), this.forbiddenNameValidator(), Validators.pattern(charsWithNumRegex), Validators.maxLength(255)]],
+    name: ['', [Validators.required, forbiddenNamesValidator(FORBIDDEN_NAMES), Validators.pattern(charsWithNumRegex), Validators.maxLength(255)]],
     function: [AggFunction.AVG],
     allowFilter: [false],
     filter: ['', Validators.required],
@@ -63,7 +66,8 @@ export class CalculatedFieldMetricsPanelComponent implements OnInit {
       type: [AggInputType.key],
       key: ['', Validators.required],
       function: ['', Validators.required],
-    })
+    }),
+    defaultValue: [null]
   });
 
   entityFilter: EntityFilter;
@@ -84,6 +88,8 @@ export class CalculatedFieldMetricsPanelComponent implements OnInit {
   }
 
   ngOnInit(): void {
+    this.updatedForm();
+
     const data: CalculatedFieldAggMetricValuePanel = {
       ...this.metric,
       allowFilter: !!this.metric.filter,
@@ -110,6 +116,15 @@ export class CalculatedFieldMetricsPanelComponent implements OnInit {
     this.popover.hide();
   }
 
+  private updatedForm(): void {
+    this.metricForm.get('name').addValidators(uniqueNameValidator(this.usedNames));
+    this.metricForm.get('name').updateValueAndValidity({emitEvent: false});
+
+    if (!this.simpleMode) {
+      this.metricForm.removeControl('defaultValue', {emitEvent: false});
+    }
+  }
+
   private observeFilterAllowChange(): void {
     this.metricForm.get('allowFilter').valueChanges
       .pipe(takeUntilDestroyed())
@@ -148,21 +163,4 @@ export class CalculatedFieldMetricsPanelComponent implements OnInit {
       this.metricForm.get('input.key').markAsTouched();
     }
   }
-
-  private uniqNameRequired(): ValidatorFn {
-    return (control: FormControl) => {
-      const newName = control.value.trim().toLowerCase();
-      const isDuplicate = this.usedNames?.some(name => name.toLowerCase() === newName);
-
-      return isDuplicate ? { duplicateName: true } : null;
-    };
-  }
-
-  private forbiddenNameValidator(): ValidatorFn {
-    return (control: FormControl) => {
-      const trimmedValue = control.value.trim().toLowerCase();
-      const forbiddenNames = ['ctx', 'e', 'pi'];
-      return forbiddenNames.includes(trimmedValue) ? { forbiddenName: true } : null;
-    };
-  }
 }
diff --git a/ui-ngx/src/app/modules/home/components/calculated-fields/components/metrics/calculated-field-metrics-table.module.ts b/ui-ngx/src/app/modules/home/components/calculated-fields/components/metrics/calculated-field-metrics-table.module.ts
index 14a6a3963f..e7e45fd445 100644
--- a/ui-ngx/src/app/modules/home/components/calculated-fields/components/metrics/calculated-field-metrics-table.module.ts
+++ b/ui-ngx/src/app/modules/home/components/calculated-fields/components/metrics/calculated-field-metrics-table.module.ts
@@ -24,7 +24,6 @@ import {
   CalculatedFieldMetricsPanelComponent
 } from '@home/components/calculated-fields/components/metrics/calculated-field-metrics-panel.component';
 
-
 @NgModule({
   imports: [
     CommonModule,
diff --git a/ui-ngx/src/app/shared/models/calculated-field.models.ts b/ui-ngx/src/app/shared/models/calculated-field.models.ts
index 432f826ebc..321c176cde 100644
--- a/ui-ngx/src/app/shared/models/calculated-field.models.ts
+++ b/ui-ngx/src/app/shared/models/calculated-field.models.ts
@@ -314,14 +314,15 @@ export const AggIntervalTypeTranslations = new Map<AggIntervalType, string>(
 export interface AggInterval {
   type: AggIntervalType;
   tz: string;
-  offsetMillis?: number
-  multiplier?: number
+  offsetSec?: number
+  durationSec?: number
 }
 
 export interface CalculatedFieldAggMetric {
   function: AggFunction;
   filter?: string;
   input: AggKeyInput | AggFunctionInput;
+  defaultValue?: number;
 }
 
 export interface CalculatedFieldAggMetricValue extends CalculatedFieldAggMetric {
diff --git a/ui-ngx/src/assets/locale/locale.constant-en_US.json b/ui-ngx/src/assets/locale/locale.constant-en_US.json
index 58b100490d..7341694fdf 100644
--- a/ui-ngx/src/assets/locale/locale.constant-en_US.json
+++ b/ui-ngx/src/assets/locale/locale.constant-en_US.json
@@ -1195,6 +1195,7 @@
         "aggregate-interval-type": "Aggregate interval type",
         "aggregate-interval-value": "Aggregate interval value",
         "aggregate-interval-value-required": "Aggregate interval value is required",
+        "aggregate-interval-value-min": "Aggregate interval value should be at least 1 minute",
         "aggregate-period": {
             "hour": "Hour",
             "day": "Day",
@@ -1213,15 +1214,18 @@
             "apply-offset-hint": "Defines how much to shift the start of each aggregation period (e.g., +10 minutes - 00:10, 01:10).",
             "offset-value": "Offset value",
             "offset-value-required": "Offset value is required",
+            "offset-value-min": "Offset value must be a positive integer",
             "wait-delay": "Wait for delayed telemetry",
-            "wait-delay-hint": "Waits for delayed telemetry after the interval ends.",
-            "wait-duration": "Duration",
-            "wait-duration-required": "Duration is required",
-            "wait-duration-hint": "Defines how long to wait for delayed data after the interval ends.",
+            "wait-delay-hint": "Waits for delayed telemetry after the interval ends",
+            "duration": "Duration",
+            "duration-required": "Duration is required",
+            "duration-min": "Duration should be at least 1 minute",
+            "duration-hint": "Defines how long to wait for delayed data after the interval ends",
             "check-interval": "Check for telemetry every",
             "check-interval-required": "Check for telemetry every is required",
+            "check-interval-min": "Check interval should be at least 30 seconds",
             "check-interval-max": "Check interval need be less than the duration",
-            "check-interval-hint": "Defines how often to recheck for late telemetry during the watermark period."
+            "check-interval-hint": "Defines how often to recheck for late telemetry during the watermark period"
         },
         "hint": {
             "arguments-simple-with-rolling": "Simple type calculated field should not contain keys with time series rolling type.",