diff --git a/src/components/admin/ParkForm.tsx b/src/components/admin/ParkForm.tsx
index 6c613388..dc2c1de6 100644
--- a/src/components/admin/ParkForm.tsx
+++ b/src/components/admin/ParkForm.tsx
@@ -293,7 +293,7 @@ export function ParkForm({ onSubmit, onCancel, initialData, isEditing = false }:
             <div className="space-y-2">
               <Label>Status *</Label>
               <Select 
-                onValueChange={(value) => setValue('status', value as any)} 
+                onValueChange={(value) => setValue('status', value)} 
                 defaultValue={initialData?.status || 'operating'}
               >
                 <SelectTrigger>
diff --git a/src/components/admin/RideForm.tsx b/src/components/admin/RideForm.tsx
index 7a435df0..210d04ba 100644
--- a/src/components/admin/RideForm.tsx
+++ b/src/components/admin/RideForm.tsx
@@ -29,8 +29,8 @@ import { useManufacturers, useRideModels } from '@/hooks/useAutocompleteData';
 import { useUserRole } from '@/hooks/useUserRole';
 import { ManufacturerForm } from './ManufacturerForm';
 import { RideModelForm } from './RideModelForm';
-import { TechnicalSpecsEditor } from './editors/TechnicalSpecsEditor';
-import { CoasterStatsEditor } from './editors/CoasterStatsEditor';
+import { TechnicalSpecsEditor, validateTechnicalSpecs } from './editors/TechnicalSpecsEditor';
+import { CoasterStatsEditor, validateCoasterStats } from './editors/CoasterStatsEditor';
 import { FormerNamesEditor } from './editors/FormerNamesEditor';
 import { 
   convertValueToMetric,
@@ -222,6 +222,31 @@ export function RideForm({ onSubmit, onCancel, initialData, isEditing = false }:
 
   const handleFormSubmit = async (data: RideFormData) => {    
     try {
+      // Validate coaster stats
+      if (coasterStats && coasterStats.length > 0) {
+        const statsValidation = validateCoasterStats(coasterStats);
+        if (!statsValidation.valid) {
+          toast({
+            title: 'Invalid coaster statistics',
+            description: statsValidation.errors.join(', '),
+            variant: 'destructive'
+          });
+          return;
+        }
+      }
+      
+      // Validate technical specs
+      if (technicalSpecs && technicalSpecs.length > 0) {
+        const specsValidation = validateTechnicalSpecs(technicalSpecs);
+        if (!specsValidation.valid) {
+          toast({
+            title: 'Invalid technical specifications',
+            description: specsValidation.errors.join(', '),
+            variant: 'destructive'
+          });
+          return;
+        }
+      }
       
       // Convert form values back to metric for storage
       const metricData = {
@@ -349,7 +374,7 @@ export function RideForm({ onSubmit, onCancel, initialData, isEditing = false }:
             <div className="space-y-2">
               <Label>Status *</Label>
               <Select 
-                onValueChange={(value) => setValue('status', value as any)} 
+                onValueChange={(value) => setValue('status', value as "operating" | "closed_permanently" | "closed_temporarily" | "under_construction" | "relocated" | "stored" | "demolished")} 
                 defaultValue={initialData?.status || 'operating'}
               >
                 <SelectTrigger>
diff --git a/src/components/admin/editors/CoasterStatsEditor.tsx b/src/components/admin/editors/CoasterStatsEditor.tsx
index 7a22834b..79d818fc 100644
--- a/src/components/admin/editors/CoasterStatsEditor.tsx
+++ b/src/components/admin/editors/CoasterStatsEditor.tsx
@@ -1,4 +1,5 @@
 import { Plus, Trash2 } from "lucide-react";
+import { useState } from "react";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
@@ -15,6 +16,7 @@ import {
   getDisplayUnit
 } from "@/lib/units";
 import { validateMetricUnit } from "@/lib/unitValidation";
+import { getErrorMessage } from "@/lib/errorHandler";
 
 interface CoasterStat {
   stat_name: string;
@@ -49,6 +51,7 @@ export function CoasterStatsEditor({
   categories = DEFAULT_CATEGORIES 
 }: CoasterStatsEditorProps) {
   const { preferences } = useUnitPreferences();
+  const [unitErrors, setUnitErrors] = useState<Record<number, string>>({});
   
   const addStat = () => {
     onChange([
@@ -91,8 +94,17 @@ export function CoasterStatsEditor({
       try {
         validateMetricUnit(value, 'Unit');
         newStats[index] = { ...newStats[index], [field]: value };
-      } catch (error) {
-        toast.error(`Invalid unit: ${value}. Please use metric units only (km/h, m, cm, kg, G, etc.)`);
+        // Clear error for this index
+        setUnitErrors(prev => {
+          const updated = { ...prev };
+          delete updated[index];
+          return updated;
+        });
+      } catch (error: unknown) {
+        const message = getErrorMessage(error);
+        toast.error(message);
+        // Store error for visual feedback
+        setUnitErrors(prev => ({ ...prev, [index]: message }));
         return;
       }
     } else {
@@ -202,7 +214,14 @@ export function CoasterStatsEditor({
                       value={stat.unit || ''}
                       onChange={(e) => updateStat(index, 'unit', e.target.value)}
                       placeholder="km/h, m, G..."
+                      className={unitErrors[index] ? 'border-destructive' : ''}
                     />
+                    {unitErrors[index] && (
+                      <p className="text-xs text-destructive mt-1">{unitErrors[index]}</p>
+                    )}
+                    <p className="text-xs text-muted-foreground mt-1">
+                      ⚠️ Use metric units only: km/h, m, cm, kg, G, celsius
+                    </p>
                   </div>
                 </div>
 
@@ -253,3 +272,28 @@ export function CoasterStatsEditor({
     </div>
   );
 }
+
+/**
+ * Validates coaster stats before submission
+ */
+export function validateCoasterStats(stats: CoasterStat[]): { valid: boolean; errors: string[] } {
+  const errors: string[] = [];
+  
+  stats.forEach((stat, index) => {
+    if (!stat.stat_name?.trim()) {
+      errors.push(`Stat ${index + 1}: Name is required`);
+    }
+    if (stat.stat_value === null || stat.stat_value === undefined) {
+      errors.push(`Stat ${index + 1} (${stat.stat_name}): Value is required`);
+    }
+    if (stat.unit) {
+      try {
+        validateMetricUnit(stat.unit, `Stat ${index + 1} (${stat.stat_name})`);
+      } catch (error: unknown) {
+        errors.push(getErrorMessage(error));
+      }
+    }
+  });
+  
+  return { valid: errors.length === 0, errors };
+}
diff --git a/src/components/admin/editors/TechnicalSpecsEditor.tsx b/src/components/admin/editors/TechnicalSpecsEditor.tsx
index ed051d0e..ba60a223 100644
--- a/src/components/admin/editors/TechnicalSpecsEditor.tsx
+++ b/src/components/admin/editors/TechnicalSpecsEditor.tsx
@@ -1,4 +1,5 @@
 import { Plus, Trash2 } from "lucide-react";
+import { useState } from "react";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
@@ -13,7 +14,8 @@ import {
   getMetricUnit,
   getDisplayUnit
 } from "@/lib/units";
-import { validateMetricUnit } from "@/lib/unitValidation";
+import { validateMetricUnit, METRIC_UNITS } from "@/lib/unitValidation";
+import { getErrorMessage } from "@/lib/errorHandler";
 
 interface TechnicalSpec {
   spec_name: string;
@@ -32,7 +34,6 @@ interface TechnicalSpecsEditorProps {
 }
 
 const DEFAULT_CATEGORIES = ['Performance', 'Safety', 'Design', 'Capacity', 'Technical', 'Other'];
-const COMMON_UNITS = ['m', 'km/h', 'mph', 'ft', 'seconds', 'minutes', 'kg', 'lbs', 'passengers', '%'];
 
 export function TechnicalSpecsEditor({ 
   specs, 
@@ -41,6 +42,7 @@ export function TechnicalSpecsEditor({
   commonSpecs = []
 }: TechnicalSpecsEditorProps) {
   const { preferences } = useUnitPreferences();
+  const [unitErrors, setUnitErrors] = useState<Record<number, string>>({});
   
   const addSpec = () => {
     onChange([
@@ -70,8 +72,17 @@ export function TechnicalSpecsEditor({
       try {
         validateMetricUnit(value, 'Unit');
         newSpecs[index] = { ...newSpecs[index], [field]: value };
-      } catch (error) {
-        toast.error(`Invalid unit: ${value}. Please use metric units only (m, km/h, cm, kg, celsius, etc.)`);
+        // Clear error for this index
+        setUnitErrors(prev => {
+          const updated = { ...prev };
+          delete updated[index];
+          return updated;
+        });
+      } catch (error: unknown) {
+        const message = getErrorMessage(error);
+        toast.error(message);
+        // Store error for visual feedback
+        setUnitErrors(prev => ({ ...prev, [index]: message }));
         return;
       }
     } else {
@@ -220,10 +231,17 @@ export function TechnicalSpecsEditor({
                       onChange={(e) => updateSpec(index, 'unit', e.target.value)}
                       placeholder="Unit"
                       list={`units-${index}`}
+                      className={unitErrors[index] ? 'border-destructive' : ''}
                     />
                     <datalist id={`units-${index}`}>
-                      {COMMON_UNITS.map(u => <option key={u} value={u} />)}
+                      {METRIC_UNITS.map(u => <option key={u} value={u} />)}
                     </datalist>
+                    {unitErrors[index] && (
+                      <p className="text-xs text-destructive mt-1">{unitErrors[index]}</p>
+                    )}
+                    <p className="text-xs text-muted-foreground mt-1">
+                      ⚠️ Metric units only
+                    </p>
                   </div>
                   <Button
                     type="button"
@@ -242,3 +260,28 @@ export function TechnicalSpecsEditor({
     </div>
   );
 }
+
+/**
+ * Validates technical specs before submission
+ */
+export function validateTechnicalSpecs(specs: TechnicalSpec[]): { valid: boolean; errors: string[] } {
+  const errors: string[] = [];
+  
+  specs.forEach((spec, index) => {
+    if (!spec.spec_name?.trim()) {
+      errors.push(`Spec ${index + 1}: Name is required`);
+    }
+    if (!spec.spec_value?.trim()) {
+      errors.push(`Spec ${index + 1} (${spec.spec_name}): Value is required`);
+    }
+    if (spec.unit) {
+      try {
+        validateMetricUnit(spec.unit, `Spec ${index + 1} (${spec.spec_name})`);
+      } catch (error: unknown) {
+        errors.push(getErrorMessage(error));
+      }
+    }
+  });
+  
+  return { valid: errors.length === 0, errors };
+}
diff --git a/src/components/ui/calendar.tsx b/src/components/ui/calendar.tsx
index f20832bf..dc06f467 100644
--- a/src/components/ui/calendar.tsx
+++ b/src/components/ui/calendar.tsx
@@ -55,17 +55,9 @@ function Calendar({ className, classNames, showOutsideDays = true, ...props }: C
         ...classNames,
       }}
       components={{
-        // DOCUMENTED EXCEPTION: Radix UI Calendar types require complex casting
-        // The react-day-picker component's internal types don't match the external API
-        // Safe because React validates component props at runtime
-        // See: https://github.com/gpbl/react-day-picker/issues
-        Chevron: ({ orientation, ...props }: any) => {
-          if (orientation === 'left') {
-            return <ChevronLeft className="h-4 w-4" />;
-          }
-          return <ChevronRight className="h-4 w-4" />;
-        },
-      } as any}
+        IconLeft: () => <ChevronLeft className="h-4 w-4" />,
+        IconRight: () => <ChevronRight className="h-4 w-4" />,
+      }}
       {...props}
     />
   );
diff --git a/src/lib/moderation/actions.ts b/src/lib/moderation/actions.ts
index c8b1fcf7..b7d33e5f 100644
--- a/src/lib/moderation/actions.ts
+++ b/src/lib/moderation/actions.ts
@@ -356,7 +356,12 @@ export async function performModerationAction(
 
     // Use type-safe table queries based on item type
     if (item.type === 'review') {
-      const reviewUpdate = {
+      const reviewUpdate: {
+        moderation_status: 'approved' | 'rejected' | 'pending';
+        moderated_at: string;
+        moderated_by: string;
+        reviewer_notes?: string;
+      } = {
         moderation_status: action,
         moderated_at: new Date().toISOString(),
         moderated_by: moderatorId,
@@ -364,13 +369,18 @@ export async function performModerationAction(
       };
       
       const result = await createTableQuery('reviews')
-        .update(reviewUpdate as any) // Type assertion needed for dynamic update
+        .update(reviewUpdate)
         .eq('id', item.id)
         .select();
       error = result.error;
       data = result.data;
     } else {
-      const submissionUpdate = {
+      const submissionUpdate: {
+        status: 'approved' | 'rejected' | 'pending';
+        reviewed_at: string;
+        reviewer_id: string;
+        reviewer_notes?: string;
+      } = {
         status: action,
         reviewed_at: new Date().toISOString(),
         reviewer_id: moderatorId,
@@ -378,7 +388,7 @@ export async function performModerationAction(
       };
       
       const result = await createTableQuery('content_submissions')
-        .update(submissionUpdate as any) // Type assertion needed for dynamic update
+        .update(submissionUpdate)
         .eq('id', item.id)
         .select();
       error = result.error;
diff --git a/src/lib/notificationService.ts b/src/lib/notificationService.ts
index a5af5836..39ef8ad4 100644
--- a/src/lib/notificationService.ts
+++ b/src/lib/notificationService.ts
@@ -249,7 +249,7 @@ class NotificationService {
           previous: previousPrefs || null,
           updated: validated,
           timestamp: new Date().toISOString()
-        } as any
+        }
       }]);
 
       logger.info('Notification preferences updated', {
diff --git a/src/lib/requestTracking.ts b/src/lib/requestTracking.ts
index a0b793f8..e826d532 100644
--- a/src/lib/requestTracking.ts
+++ b/src/lib/requestTracking.ts
@@ -107,8 +107,8 @@ interface RequestMetadata {
 }
 
 async function logRequestMetadata(metadata: RequestMetadata): Promise<void> {
-  // Type assertion needed until Supabase types regenerate after migration
-  const { error } = await supabase.rpc('log_request_metadata' as any, {
+  // Safe cast - RPC function exists in database
+  const { error } = await supabase.rpc('log_request_metadata' as 'log_request_metadata', {
     p_request_id: metadata.requestId,
     p_user_id: metadata.userId || null,
     p_endpoint: metadata.endpoint,
diff --git a/src/lib/submissionChangeDetection.ts b/src/lib/submissionChangeDetection.ts
index 20908381..ff4ca75a 100644
--- a/src/lib/submissionChangeDetection.ts
+++ b/src/lib/submissionChangeDetection.ts
@@ -556,8 +556,8 @@ export function extractChangedFields<T extends Record<string, any>>(
     // ═══ SPECIAL HANDLING: LOCATION OBJECTS ═══
     // Location can be an object (from form) vs location_id (from DB)
     if (key === 'location' && newValue && typeof newValue === 'object') {
-      const oldLoc = originalData.location as any;
-      if (!oldLoc || !isEqual(oldLoc, newValue)) {
+      const oldLoc = originalData.location;
+      if (!oldLoc || typeof oldLoc !== 'object' || !isEqual(oldLoc, newValue)) {
         changes[key as keyof T] = newValue;
       }
       return;
diff --git a/src/pages/RideDetail.tsx b/src/pages/RideDetail.tsx
index 24551a07..0d19d7a0 100644
--- a/src/pages/RideDetail.tsx
+++ b/src/pages/RideDetail.tsx
@@ -738,7 +738,7 @@ export default function RideDetail() {
                   description: ride.description,
                   category: ride.category,
                   ride_sub_type: ride.ride_sub_type,
-                  status: ride.status as any, // Type assertion for DB status
+                  status: ride.status as "operating" | "closed_permanently" | "closed_temporarily" | "under_construction" | "relocated" | "stored" | "demolished",
                   opening_date: ride.opening_date,
                   closing_date: ride.closing_date,
                   height_requirement: ride.height_requirement,