diff --git a/src/docs/API_PATTERNS.md b/src/docs/API_PATTERNS.md
index 0689ca41..77f5a2c0 100644
--- a/src/docs/API_PATTERNS.md
+++ b/src/docs/API_PATTERNS.md
@@ -171,3 +171,49 @@ When migrating a component:
 - [ ] Replace loading state with `mutation.isPending`
 - [ ] Remove try/catch blocks from component
 - [ ] Test optimistic updates if applicable
+- [ ] Add audit log creation where appropriate
+- [ ] Ensure proper type safety with TypeScript
+
+## Available Mutation Hooks
+
+### Profile & User Management
+- `useProfileUpdateMutation` - Profile updates (username, display name, bio)
+- `useProfileLocationMutation` - Location and personal info updates
+- `usePrivacyMutations` - Privacy settings updates
+
+### Security
+- `useSecurityMutations` - Session management (revoke sessions)
+
+### Moderation
+- `useReportMutation` - Submit user reports
+- `useReportActionMutation` - Resolve/dismiss reports
+
+### Admin
+- `useAuditLogs` - Query audit logs with pagination
+
+## Cache Invalidation Guidelines
+
+Always invalidate related caches after mutations:
+
+```typescript
+// After profile update
+invalidateUserProfile(userId);
+invalidateProfileStats(userId);
+invalidateProfileActivity(userId);
+invalidateUserSearch(); // If username/display name changed
+
+// After privacy update
+invalidateUserProfile(userId);
+invalidateAuditLogs(userId);
+invalidateUserSearch(); // If privacy level changed
+
+// After report action
+invalidateModerationQueue();
+invalidateModerationStats();
+invalidateAuditLogs();
+
+// After security action
+invalidateSessions();
+invalidateAuditLogs();
+invalidateEmailChangeStatus(); // For email changes
+```
diff --git a/src/hooks/admin/useAuditLogs.ts b/src/hooks/admin/useAuditLogs.ts
new file mode 100644
index 00000000..f09a506a
--- /dev/null
+++ b/src/hooks/admin/useAuditLogs.ts
@@ -0,0 +1,55 @@
+import { useQuery } from '@tanstack/react-query';
+import { supabase } from '@/integrations/supabase/client';
+import { queryKeys } from '@/lib/queryKeys';
+
+interface AuditLogFilters {
+  userId?: string;
+  action?: string;
+  page?: number;
+  pageSize?: number;
+}
+
+/**
+ * Hook for querying audit logs with proper caching
+ * Provides: paginated audit log queries with filtering
+ */
+export function useAuditLogs(filters: AuditLogFilters = {}) {
+  const { userId, action, page = 1, pageSize = 50 } = filters;
+
+  return useQuery({
+    queryKey: queryKeys.admin.auditLogs(userId),
+    queryFn: async () => {
+      let query = supabase
+        .from('profile_audit_log')
+        .select('*', { count: 'exact' })
+        .order('created_at', { ascending: false });
+
+      if (userId) {
+        query = query.eq('user_id', userId);
+      }
+
+      if (action) {
+        query = query.eq('action', action);
+      }
+
+      // Apply pagination
+      const startIndex = (page - 1) * pageSize;
+      const endIndex = startIndex + pageSize - 1;
+      query = query.range(startIndex, endIndex);
+
+      const { data, error, count } = await query;
+
+      if (error) throw error;
+
+      return {
+        logs: data || [],
+        total: count || 0,
+        page,
+        pageSize,
+        totalPages: Math.ceil((count || 0) / pageSize),
+      };
+    },
+    staleTime: 2 * 60 * 1000, // 2 minutes
+    refetchOnWindowFocus: false,
+  });
+}
diff --git a/src/hooks/privacy/useBlockUserMutation.ts b/src/hooks/privacy/useBlockUserMutation.ts
new file mode 100644
index 00000000..0b16e16a
--- /dev/null
+++ b/src/hooks/privacy/useBlockUserMutation.ts
@@ -0,0 +1,68 @@
+import { useMutation, useQueryClient } from '@tanstack/react-query';
+import { supabase } from '@/integrations/supabase/client';
+import { toast } from 'sonner';
+import { getErrorMessage } from '@/lib/errorHandler';
+import { useQueryInvalidation } from '@/lib/queryInvalidation';
+import { useAuth } from '@/hooks/useAuth';
+
+interface UnblockUserParams {
+  blockId: string;
+  blockedUserId: string;
+  username: string;
+}
+
+/**
+ * Hook for user blocking/unblocking mutations
+ * Provides: unblock user with automatic audit logging and cache invalidation
+ */
+export function useBlockUserMutation() {
+  const { user } = useAuth();
+  const queryClient = useQueryClient();
+  const { invalidateAuditLogs } = useQueryInvalidation();
+
+  const unblockUser = useMutation({
+    mutationFn: async ({ blockId, blockedUserId, username }: UnblockUserParams) => {
+      if (!user) throw new Error('Authentication required');
+
+      const { error } = await supabase
+        .from('user_blocks')
+        .delete()
+        .eq('id', blockId);
+
+      if (error) throw error;
+
+      // Log to audit trail
+      await supabase.from('profile_audit_log').insert([{
+        user_id: user.id,
+        changed_by: user.id,
+        action: 'user_unblocked',
+        changes: JSON.parse(JSON.stringify({
+          blocked_user_id: blockedUserId,
+          username,
+          timestamp: new Date().toISOString()
+        }))
+      }]);
+
+      return { blockedUserId, username };
+    },
+    onError: (error: unknown) => {
+      toast.error("Error", {
+        description: getErrorMessage(error),
+      });
+    },
+    onSuccess: (_data, { username }) => {
+      // Invalidate blocked users cache
+      queryClient.invalidateQueries({ queryKey: ['blocked-users'] });
+      invalidateAuditLogs();
+      
+      toast.success("User Unblocked", {
+        description: `You have unblocked @${username}`,
+      });
+    },
+  });
+
+  return {
+    unblockUser,
+    isUnblocking: unblockUser.isPending,
+  };
+}
diff --git a/src/hooks/privacy/useBlockedUsers.ts b/src/hooks/privacy/useBlockedUsers.ts
new file mode 100644
index 00000000..fdf895c0
--- /dev/null
+++ b/src/hooks/privacy/useBlockedUsers.ts
@@ -0,0 +1,52 @@
+import { useQuery } from '@tanstack/react-query';
+import { supabase } from '@/integrations/supabase/client';
+import { useAuth } from '@/hooks/useAuth';
+import type { UserBlock } from '@/types/privacy';
+
+/**
+ * Hook for querying blocked users
+ * Provides: list of blocked users with profile information
+ */
+export function useBlockedUsers() {
+  const { user } = useAuth();
+
+  return useQuery({
+    queryKey: ['blocked-users', user?.id],
+    queryFn: async () => {
+      if (!user) return [];
+
+      // First get the blocked user IDs
+      const { data: blocks, error: blocksError } = await supabase
+        .from('user_blocks')
+        .select('id, blocked_id, reason, created_at')
+        .eq('blocker_id', user.id)
+        .order('created_at', { ascending: false });
+
+      if (blocksError) throw blocksError;
+
+      if (!blocks || blocks.length === 0) {
+        return [];
+      }
+
+      // Then get the profile information for blocked users
+      const blockedIds = blocks.map(b => b.blocked_id);
+      const { data: profiles, error: profilesError } = await supabase
+        .from('profiles')
+        .select('user_id, username, display_name, avatar_url')
+        .in('user_id', blockedIds);
+
+      if (profilesError) throw profilesError;
+
+      // Combine the data
+      const blockedUsersWithProfiles: UserBlock[] = blocks.map(block => ({
+        ...block,
+        blocker_id: user.id,
+        blocked_profile: profiles?.find(p => p.user_id === block.blocked_id)
+      }));
+
+      return blockedUsersWithProfiles;
+    },
+    enabled: !!user,
+    staleTime: 5 * 60 * 1000, // 5 minutes
+  });
+}
diff --git a/src/hooks/privacy/usePrivacyMutations.ts b/src/hooks/privacy/usePrivacyMutations.ts
new file mode 100644
index 00000000..e9781722
--- /dev/null
+++ b/src/hooks/privacy/usePrivacyMutations.ts
@@ -0,0 +1,92 @@
+import { useMutation, useQueryClient } from '@tanstack/react-query';
+import { supabase } from '@/integrations/supabase/client';
+import { toast } from 'sonner';
+import { getErrorMessage } from '@/lib/errorHandler';
+import { useQueryInvalidation } from '@/lib/queryInvalidation';
+import { useAuth } from '@/hooks/useAuth';
+import type { PrivacyFormData } from '@/types/privacy';
+
+/**
+ * Hook for privacy settings mutations
+ * Provides: privacy settings updates with automatic audit logging and cache invalidation
+ */
+export function usePrivacyMutations() {
+  const { user } = useAuth();
+  const queryClient = useQueryClient();
+  const { 
+    invalidateUserProfile, 
+    invalidateAuditLogs,
+    invalidateUserSearch 
+  } = useQueryInvalidation();
+
+  const updatePrivacy = useMutation({
+    mutationFn: async (data: PrivacyFormData) => {
+      if (!user) throw new Error('Authentication required');
+
+      // Update profile privacy settings
+      const { error: profileError } = await supabase
+        .from('profiles')
+        .update({
+          privacy_level: data.privacy_level,
+          show_pronouns: data.show_pronouns,
+          updated_at: new Date().toISOString()
+        })
+        .eq('user_id', user.id);
+      
+      if (profileError) throw profileError;
+      
+      // Extract privacy settings (exclude profile fields)
+      const { privacy_level, show_pronouns, ...privacySettings } = data;
+      
+      // Update user preferences
+      const { error: prefsError } = await supabase
+        .from('user_preferences')
+        .upsert([{
+          user_id: user.id,
+          privacy_settings: privacySettings,
+          updated_at: new Date().toISOString()
+        }]);
+      
+      if (prefsError) throw prefsError;
+      
+      // Log to audit trail
+      await supabase.from('profile_audit_log').insert([{
+        user_id: user.id,
+        changed_by: user.id,
+        action: 'privacy_settings_updated',
+        changes: {
+          updated: privacySettings,
+          timestamp: new Date().toISOString()
+        }
+      }]);
+
+      return { privacySettings };
+    },
+    onError: (error: unknown) => {
+      toast.error("Update Failed", {
+        description: getErrorMessage(error),
+      });
+    },
+    onSuccess: (_data, variables) => {
+      // Invalidate all related caches
+      if (user) {
+        invalidateUserProfile(user.id);
+        invalidateAuditLogs(user.id);
+        
+        // If privacy level changed, invalidate user search
+        if (variables.privacy_level) {
+          invalidateUserSearch();
+        }
+      }
+      
+      toast.success("Privacy Updated", {
+        description: "Your privacy preferences have been successfully saved.",
+      });
+    },
+  });
+
+  return {
+    updatePrivacy,
+    isUpdating: updatePrivacy.isPending,
+  };
+}
diff --git a/src/hooks/profile/useProfileLocationMutation.ts b/src/hooks/profile/useProfileLocationMutation.ts
new file mode 100644
index 00000000..d88a8755
--- /dev/null
+++ b/src/hooks/profile/useProfileLocationMutation.ts
@@ -0,0 +1,82 @@
+import { useMutation, useQueryClient } from '@tanstack/react-query';
+import { supabase } from '@/integrations/supabase/client';
+import { toast } from 'sonner';
+import { getErrorMessage } from '@/lib/errorHandler';
+import { useQueryInvalidation } from '@/lib/queryInvalidation';
+import { useAuth } from '@/hooks/useAuth';
+import type { LocationFormData } from '@/types/location';
+
+/**
+ * Hook for profile location mutations
+ * Provides: location updates with automatic audit logging and cache invalidation
+ */
+export function useProfileLocationMutation() {
+  const { user } = useAuth();
+  const queryClient = useQueryClient();
+  const { 
+    invalidateUserProfile, 
+    invalidateAuditLogs 
+  } = useQueryInvalidation();
+
+  const updateLocation = useMutation({
+    mutationFn: async (data: LocationFormData) => {
+      if (!user) throw new Error('Authentication required');
+
+      const previousProfile = {
+        personal_location: data.personal_location,
+        home_park_id: data.home_park_id,
+        timezone: data.timezone,
+        preferred_language: data.preferred_language,
+        preferred_pronouns: data.preferred_pronouns
+      };
+
+      const { error: profileError } = await supabase
+        .from('profiles')
+        .update({
+          preferred_pronouns: data.preferred_pronouns || null,
+          timezone: data.timezone,
+          preferred_language: data.preferred_language,
+          personal_location: data.personal_location || null,
+          home_park_id: data.home_park_id || null,
+          updated_at: new Date().toISOString()
+        })
+        .eq('user_id', user.id);
+      
+      if (profileError) throw profileError;
+
+      // Log to audit trail
+      await supabase.from('profile_audit_log').insert([{
+        user_id: user.id,
+        changed_by: user.id,
+        action: 'location_info_updated',
+        changes: JSON.parse(JSON.stringify({
+          previous: { profile: previousProfile },
+          updated: { profile: data },
+          timestamp: new Date().toISOString()
+        }))
+      }]);
+
+      return data;
+    },
+    onError: (error: unknown) => {
+      toast.error("Update Failed", {
+        description: getErrorMessage(error),
+      });
+    },
+    onSuccess: () => {
+      if (user) {
+        invalidateUserProfile(user.id);
+        invalidateAuditLogs(user.id);
+      }
+      
+      toast.success("Settings Saved", {
+        description: "Your location and personal information have been updated.",
+      });
+    },
+  });
+
+  return {
+    updateLocation,
+    isUpdating: updateLocation.isPending,
+  };
+}
diff --git a/src/hooks/reports/useReportActionMutation.ts b/src/hooks/reports/useReportActionMutation.ts
new file mode 100644
index 00000000..b5ba573f
--- /dev/null
+++ b/src/hooks/reports/useReportActionMutation.ts
@@ -0,0 +1,86 @@
+import { useMutation, useQueryClient } from '@tanstack/react-query';
+import { supabase } from '@/integrations/supabase/client';
+import { toast } from 'sonner';
+import { getErrorMessage } from '@/lib/errorHandler';
+import { useQueryInvalidation } from '@/lib/queryInvalidation';
+import { useAuth } from '@/hooks/useAuth';
+
+interface ReportActionParams {
+  reportId: string;
+  action: 'reviewed' | 'dismissed';
+}
+
+/**
+ * Hook for report action mutations
+ * Provides: report resolution/dismissal with automatic audit logging and cache invalidation
+ */
+export function useReportActionMutation() {
+  const { user } = useAuth();
+  const queryClient = useQueryClient();
+  const { invalidateModerationQueue, invalidateModerationStats, invalidateAuditLogs } = useQueryInvalidation();
+
+  const resolveReport = useMutation({
+    mutationFn: async ({ reportId, action }: ReportActionParams) => {
+      if (!user) throw new Error('Authentication required');
+
+      // Fetch full report details for audit log
+      const { data: reportData } = await supabase
+        .from('reports')
+        .select('reporter_id, reported_entity_type, reported_entity_id, reason')
+        .eq('id', reportId)
+        .single();
+      
+      const { error } = await supabase
+        .from('reports')
+        .update({
+          status: action,
+          reviewed_by: user.id,
+          reviewed_at: new Date().toISOString(),
+        })
+        .eq('id', reportId);
+
+      if (error) throw error;
+
+      // Log audit trail for report resolution
+      if (reportData) {
+        try {
+          await supabase.rpc('log_admin_action', {
+            _admin_user_id: user.id,
+            _target_user_id: reportData.reporter_id,
+            _action: action === 'reviewed' ? 'report_resolved' : 'report_dismissed',
+            _details: {
+              report_id: reportId,
+              reported_entity_type: reportData.reported_entity_type,
+              reported_entity_id: reportData.reported_entity_id,
+              report_reason: reportData.reason,
+              action: action
+            }
+          });
+        } catch (auditError) {
+          console.error('Failed to log report action audit:', auditError);
+        }
+      }
+
+      return { action, reportData };
+    },
+    onError: (error: unknown) => {
+      toast.error("Error", {
+        description: getErrorMessage(error),
+      });
+    },
+    onSuccess: (_data, { action }) => {
+      invalidateModerationQueue();
+      invalidateModerationStats();
+      invalidateAuditLogs();
+      
+      toast.success(`Report ${action}`, {
+        description: `The report has been marked as ${action}`,
+      });
+    },
+  });
+
+  return {
+    resolveReport,
+    isResolving: resolveReport.isPending,
+  };
+}
diff --git a/src/hooks/security/useSecurityMutations.ts b/src/hooks/security/useSecurityMutations.ts
new file mode 100644
index 00000000..6ae389b1
--- /dev/null
+++ b/src/hooks/security/useSecurityMutations.ts
@@ -0,0 +1,54 @@
+import { useMutation, useQueryClient } from '@tanstack/react-query';
+import { supabase } from '@/integrations/supabase/client';
+import { toast } from 'sonner';
+import { getErrorMessage } from '@/lib/errorHandler';
+import { useQueryInvalidation } from '@/lib/queryInvalidation';
+
+interface RevokeSessionParams {
+  sessionId: string;
+  isCurrent: boolean;
+}
+
+/**
+ * Hook for session management mutations
+ * Provides: session revocation with automatic cache invalidation
+ */
+export function useSecurityMutations() {
+  const queryClient = useQueryClient();
+  const { invalidateSessions, invalidateAuditLogs } = useQueryInvalidation();
+
+  const revokeSession = useMutation({
+    mutationFn: async ({ sessionId }: RevokeSessionParams) => {
+      const { error } = await supabase.rpc('revoke_my_session', { 
+        session_id: sessionId 
+      });
+      
+      if (error) throw error;
+    },
+    onError: (error: unknown) => {
+      toast.error("Error", {
+        description: getErrorMessage(error),
+      });
+    },
+    onSuccess: (_data, { isCurrent }) => {
+      invalidateSessions();
+      invalidateAuditLogs();
+      
+      toast.success("Success", {
+        description: "Session revoked successfully",
+      });
+      
+      // Redirect to login if current session was revoked
+      if (isCurrent) {
+        setTimeout(() => {
+          window.location.href = '/auth';
+        }, 1000);
+      }
+    },
+  });
+
+  return {
+    revokeSession,
+    isRevoking: revokeSession.isPending,
+  };
+}
diff --git a/src/hooks/useAdminSettings.ts b/src/hooks/useAdminSettings.ts
index fbcc2e52..6247755e 100644
--- a/src/hooks/useAdminSettings.ts
+++ b/src/hooks/useAdminSettings.ts
@@ -4,6 +4,7 @@ import { useAuth } from './useAuth';
 import { useUserRole } from './useUserRole';
 import { useToast } from './use-toast';
 import { useCallback, useMemo } from 'react';
+import { queryKeys } from '@/lib/queryKeys';
 
 interface AdminSetting {
   id: string;
@@ -24,7 +25,7 @@ export function useAdminSettings() {
     isLoading,
     error
   } = useQuery({
-    queryKey: ['admin-settings'],
+    queryKey: queryKeys.admin.settings(),
     queryFn: async () => {
       const { data, error } = await supabase
         .from('admin_settings')
@@ -59,7 +60,7 @@ export function useAdminSettings() {
       if (error) throw error;
     },
     onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ['admin-settings'] });
+      queryClient.invalidateQueries({ queryKey: queryKeys.admin.settings() });
       toast({
         title: "Setting Updated",
         description: "The setting has been saved successfully.",
diff --git a/src/lib/queryInvalidation.ts b/src/lib/queryInvalidation.ts
index c97b15b3..7be30724 100644
--- a/src/lib/queryInvalidation.ts
+++ b/src/lib/queryInvalidation.ts
@@ -331,6 +331,26 @@ export function useQueryInvalidation() {
       });
     },
     
+    /**
+     * Invalidate email change status cache
+     * Call this after email change operations
+     */
+    invalidateEmailChangeStatus: () => {
+      queryClient.invalidateQueries({ 
+        queryKey: queryKeys.security.emailChangeStatus() 
+      });
+    },
+    
+    /**
+     * Invalidate sessions cache
+     * Call this after session operations (login, logout, revoke)
+     */
+    invalidateSessions: () => {
+      queryClient.invalidateQueries({ 
+        queryKey: queryKeys.security.sessions() 
+      });
+    },
+    
     /**
      * Invalidate security queries
      * Call this after security-related changes (email, sessions)
diff --git a/src/pages/admin/AdminContact.tsx b/src/pages/admin/AdminContact.tsx
index e4deeca9..1c6ccbfd 100644
--- a/src/pages/admin/AdminContact.tsx
+++ b/src/pages/admin/AdminContact.tsx
@@ -80,6 +80,7 @@ import { logger } from '@/lib/logger';
 import { contactCategories } from '@/lib/contactValidation';
 import { invokeWithTracking } from '@/lib/edgeFunctionTracking';
 import { AdminLayout } from '@/components/layout/AdminLayout';
+import { queryKeys } from '@/lib/queryKeys';
 
 interface ContactSubmission {
   id: string;
@@ -159,7 +160,7 @@ export default function AdminContact() {
 
   // Fetch contact submissions
   const { data: submissions, isLoading } = useQuery({
-    queryKey: ['admin-contact-submissions', statusFilter, categoryFilter, searchQuery, showArchived],
+    queryKey: queryKeys.admin.contactSubmissions(statusFilter, categoryFilter, searchQuery, showArchived),
     queryFn: async () => {
       let query = supabase
         .from('contact_submissions')
@@ -282,7 +283,10 @@ export default function AdminContact() {
           .order('created_at', { ascending: true })
           .then(({ data }) => setEmailThreads((data as EmailThread[]) || []));
       }
-      queryClient.invalidateQueries({ queryKey: ['admin-contact-submissions'] });
+      queryClient.invalidateQueries({ 
+        queryKey: ['admin-contact-submissions'],
+        exact: false 
+      });
     },
     onError: (error: Error) => {
       handleError(error, { action: 'Send Email Reply' });
@@ -320,7 +324,10 @@ export default function AdminContact() {
       if (error) throw error;
     },
     onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ['admin-contact-submissions'] });
+      queryClient.invalidateQueries({ 
+        queryKey: ['admin-contact-submissions'],
+        exact: false 
+      });
       handleSuccess('Status Updated', 'Contact submission status has been updated');
       setSelectedSubmission(null);
       setAdminNotes('');
@@ -345,7 +352,10 @@ export default function AdminContact() {
       if (error) throw error;
     },
     onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ['admin-contact-submissions'] });
+      queryClient.invalidateQueries({ 
+        queryKey: ['admin-contact-submissions'],
+        exact: false 
+      });
       handleSuccess('Archived', 'Contact submission has been archived');
       setSelectedSubmission(null);
     },
@@ -368,7 +378,10 @@ export default function AdminContact() {
       if (error) throw error;
     },
     onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ['admin-contact-submissions'] });
+      queryClient.invalidateQueries({ 
+        queryKey: ['admin-contact-submissions'],
+        exact: false 
+      });
       handleSuccess('Restored', 'Contact submission has been restored from archive');
       setSelectedSubmission(null);
     },
@@ -388,7 +401,10 @@ export default function AdminContact() {
       if (error) throw error;
     },
     onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ['admin-contact-submissions'] });
+      queryClient.invalidateQueries({ 
+        queryKey: ['admin-contact-submissions'],
+        exact: false 
+      });
       handleSuccess('Deleted', 'Contact submission has been permanently deleted');
       setSelectedSubmission(null);
     },
@@ -428,7 +444,10 @@ export default function AdminContact() {
   };
 
   const handleRefreshSubmissions = () => {
-    queryClient.invalidateQueries({ queryKey: ['admin-contact-submissions'] });
+    queryClient.invalidateQueries({ 
+      queryKey: ['admin-contact-submissions'],
+      exact: false 
+    });
   };
 
   const handleCopyTicket = (ticketNumber: string) => {