diff --git a/src/app/dashboard/reservations/[id]/actions.ts b/src/app/dashboard/reservations/[id]/actions.ts
index 37feeb7..054b32a 100644
--- a/src/app/dashboard/reservations/[id]/actions.ts
+++ b/src/app/dashboard/reservations/[id]/actions.ts
@@ -3,6 +3,8 @@
 import { createClient } from "@/lib/supabase/server"
 import { revalidatePath } from "next/cache"
 
+import { logAction } from "@/lib/logger"
+
 export async function addPayment(reservationId: string, formData: FormData) {
     const supabase = await createClient()
 
@@ -10,17 +12,23 @@ export async function addPayment(reservationId: string, formData: FormData) {
     const type = formData.get('type')
     const method = formData.get('method')
 
-    const { error } = await supabase.from('payments').insert({
+    const { data, error } = await supabase.from('payments').insert({
         reservation_id: reservationId,
         amount: amount,
         payment_type: type,
         payment_method: method,
         status: 'paid', // Assuming immediate payment for now
         paid_at: new Date().toISOString(),
-    })
+    }).select().single()
 
     if (error) throw new Error(error.message)
 
+    await logAction('add_payment', 'payment', data.id, {
+        reservation_id: reservationId,
+        amount,
+        type
+    })
+
     revalidatePath(`/dashboard/reservations/${reservationId}`)
 }
 
@@ -34,6 +42,8 @@ export async function updateStatus(id: string, status: string) {
 
     if (error) throw new Error(error.message)
 
+    await logAction('update_reservation_status', 'reservation', id, { status })
+
     revalidatePath(`/dashboard/reservations/${id}`)
     revalidatePath('/dashboard/reservations')
 }
diff --git a/src/app/dashboard/reservations/new/actions.ts b/src/app/dashboard/reservations/new/actions.ts
index bf91d11..6750ef0 100644
--- a/src/app/dashboard/reservations/new/actions.ts
+++ b/src/app/dashboard/reservations/new/actions.ts
@@ -26,27 +26,62 @@ export async function createReservation(data: {
     if (conflictError) {
         throw new Error("Müsaitlik kontrolü yapılırken hata oluştu: " + conflictError.message)
     }
+    'use server'
 
-    if (conflicts && conflicts.length > 0) {
-        return { error: "Seçilen tarih ve saatte bu salon zaten dolu." }
+    import { createClient } from "@/lib/supabase/server"
+    import { revalidatePath } from "next/cache"
+    import { redirect } from "next/navigation"
+    import { logAction } from "@/lib/logger"
+
+    export async function createReservation(data: {
+        hall_id: string
+        customer_id: string
+        package_id?: string
+        start_time: string
+        end_time: string
+        notes?: string
+    }) {
+        const supabase = await createClient()
+
+        // 1. Check for conflicts
+        // We look for any reservation in the same hall that overlaps with the requested time range
+        const { data: conflicts, error: conflictError } = await supabase
+            .from('reservations')
+            .select('id')
+            .eq('hall_id', data.hall_id)
+            .neq('status', 'cancelled') // Ignore cancelled bookings
+            .or(`and(start_time.lte.${data.end_time},end_time.gte.${data.start_time})`)
+
+        if (conflictError) {
+            throw new Error("Müsaitlik kontrolü yapılırken hata oluştu: " + conflictError.message)
+        }
+
+        if (conflicts && conflicts.length > 0) {
+            return { error: "Seçilen tarih ve saatte bu salon zaten dolu." }
+        }
+
+        // 2. Create Reservation
+        const { data: newReservation, error } = await supabase.from('reservations').insert({
+            hall_id: data.hall_id,
+            customer_id: data.customer_id,
+            package_id: data.package_id || null,
+            start_time: data.start_time,
+            end_time: data.end_time,
+            status: 'pending', // Default to pending, admin must confirm
+            notes: data.notes,
+        }).select().single()
+
+        if (error) {
+            return { error: error.message }
+        }
+
+        await logAction('create_reservation', 'reservation', newReservation.id, {
+            hall_id: data.hall_id,
+            customer_id: data.customer_id,
+            start_time: data.start_time
+        })
+
+        revalidatePath('/dashboard/reservations')
+        revalidatePath('/dashboard/calendar')
+        redirect('/dashboard/reservations')
     }
-
-    // 2. Create Reservation
-    const { error } = await supabase.from('reservations').insert({
-        hall_id: data.hall_id,
-        customer_id: data.customer_id,
-        package_id: data.package_id || null,
-        start_time: data.start_time,
-        end_time: data.end_time,
-        status: 'pending', // Default to pending, admin must confirm
-        notes: data.notes,
-    })
-
-    if (error) {
-        return { error: error.message }
-    }
-
-    revalidatePath('/dashboard/reservations')
-    revalidatePath('/dashboard/calendar')
-    redirect('/dashboard/reservations')
-}
diff --git a/src/lib/logger.ts b/src/lib/logger.ts
new file mode 100644
index 0000000..3ca7756
--- /dev/null
+++ b/src/lib/logger.ts
@@ -0,0 +1,21 @@
+import { createClient } from "@/lib/supabase/server"
+
+export async function logAction(
+    action: string,
+    entityType: string,
+    entityId: string,
+    details?: any
+) {
+    const supabase = await createClient()
+    const { data: { user } } = await supabase.auth.getUser()
+
+    if (!user) return
+
+    await supabase.from('audit_logs').insert({
+        user_id: user.id,
+        action,
+        entity_type: entityType,
+        entity_id: entityId,
+        details,
+    })
+}
diff --git a/supabase_schema.sql b/supabase_schema.sql
index f28e508..dd71b2c 100644
--- a/supabase_schema.sql
+++ b/supabase_schema.sql
@@ -95,3 +95,28 @@ $$ language plpgsql security definer;
 create trigger on_auth_user_created
   after insert on auth.users
   for each row execute procedure public.handle_new_user();
+
+-- Create Audit Logs Table
+create table audit_logs (
+  id uuid default uuid_generate_v4() primary key,
+  user_id uuid references auth.users(id),
+  action text not null,
+  entity_type text not null,
+  entity_id uuid,
+  details jsonb,
+  created_at timestamp with time zone default timezone('utc'::text, now()) not null
+);
+
+-- RLS for Audit Logs
+alter table audit_logs enable row level security;
+
+create policy "Admins can read all logs" on audit_logs
+  for select using (
+    exists (
+      select 1 from profiles
+      where profiles.id = auth.uid() and profiles.role = 'admin'
+    )
+  );
+
+create policy "Users can insert logs" on audit_logs
+  for insert with check (auth.uid() = user_id);