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COST_TRACKING_IMPLEMENTATION.md
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COST_TRACKING_IMPLEMENTATION.md
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# Cost Tracking Enhancement Implementation
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## Overview
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Comprehensive cost tracking system implemented with three major features:
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1. **CPT Column** - Total cost per post in post list table
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2. **Global Cost Log** - Detailed cost tracking in settings page
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3. **Cost Shortcuts** - Quick access links in settings
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---
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## 1. CPT Column for Post List
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### File Created
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`/includes/class-admin-columns.php`
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### Features
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- **💰 AI Cost** column in post list table
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- Shows total cost per post with color coding:
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- Green: < $0.50
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- Yellow: $0.50 - $1.00
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- Red: > $1.00
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- **Sortable** - Click column header to sort by cost
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- Shows `-` for posts with no AI usage
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- Handles deleted posts gracefully
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### Implementation
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```php
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// Adds column to post list
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add_filter('manage_post_columns', 'add_cost_column');
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// Renders cost with color coding
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add_action('manage_post_custom_column', 'render_cost_column');
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// Makes column sortable
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add_filter('manage_edit-post_sortable_columns', 'make_cost_column_sortable');
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// Handles sorting query
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add_action('pre_get_posts', 'sort_by_cost');
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```
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### Initialization
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Added to `wp-agentic-writer.php`:
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```php
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if ( is_admin() ) {
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WP_Agentic_Writer_Admin_Columns::get_instance();
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}
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```
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---
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## 2. Global Cost Log Tab
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### Location
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Settings → Agentic Writer → **Cost Log** tab
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### Features
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#### **Summary Stats (4 Cards)**
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- 💰 **All Time** - Total spent across all posts
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- 📅 **This Month** - Current month spending
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- ☀️ **Today** - Today's spending
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- 📝 **Avg Per Post** - Average cost per post
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#### **Advanced Filters**
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- **Post ID** - Filter by specific post
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- **Model** - Filter by AI model used
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- **Type** - Filter by operation (chat, planning, writing, etc.)
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- **Date Range** - From/To date pickers
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- **Clear Filters** - Reset all filters
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#### **Detailed Cost Table**
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Columns:
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- Date/Time
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- Post (with link or `[Removed Post #123]` for deleted)
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- Model (displayed as code)
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- Type (formatted: Chat, Planning, Writing, etc.)
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- Input Tokens
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- Output Tokens
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- Cost ($0.0000 format)
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#### **Additional Features**
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- **Pagination** - 50 records per page
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- **Export CSV** - Download full cost log
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- **Responsive** - Horizontal scroll on small screens
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- **Hover Effects** - Row highlighting
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### Implementation
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#### Settings Tab Navigation
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Added to `class-settings.php`:
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```php
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<button type="button" class="wpaw-settings-nav-btn" data-tab="cost-log">
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<span class="dashicons dashicons-chart-line"></span>
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Cost Log
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</button>
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```
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#### Tab Content
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```php
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<div class="wpaw-tab-content" data-tab="cost-log">
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<?php $this->render_cost_log_tab(); ?>
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</div>
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```
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#### Method: `render_cost_log_tab()`
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- Queries cost database with filters
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- Calculates summary statistics
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- Renders stats grid, filters, table, pagination
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- Includes CSV export JavaScript
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---
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## 3. Cost Shortcuts
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### Location
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Settings → General → Budget & Cost Tracking section
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### Feature
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**"View Full Cost Log →"** link appears below the budget progress bar
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### Implementation
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```php
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<div class="wpaw-cost-shortcuts">
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<a href="<?php echo admin_url('options-general.php?page=wp-agentic-writer-settings&tab=cost-log'); ?>"
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class="wpaw-cost-shortcut-link">
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<span class="dashicons dashicons-chart-line"></span>
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View Full Cost Log →
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</a>
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</div>
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```
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### Styling
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- Blue border with light blue background
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- Hover: Blue background with white text
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- Smooth transitions
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- Icon + text layout
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---
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## CSS Styling Added
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### File Modified
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`/assets/css/admin.css`
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### New Styles
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#### Cost Shortcuts
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```css
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.wpaw-cost-shortcuts
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.wpaw-cost-shortcut-link
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.wpaw-cost-shortcut-link:hover
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```
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#### Cost Stats Grid
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```css
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.wpaw-cost-stats-grid
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.wpaw-cost-stat-card
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.wpaw-cost-stat-icon
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.wpaw-cost-stat-value
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.wpaw-cost-stat-label
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```
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#### Cost Filters
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```css
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.wpaw-cost-filters
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.wpaw-filter-row
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.wpaw-filter-field
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.wpaw-filter-actions
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```
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#### Cost Log Table
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```css
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.wpaw-cost-log-table-wrapper
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.wpaw-cost-log-table
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.wpaw-cost-log-table thead
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.wpaw-cost-log-table th
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.wpaw-cost-log-table td
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.wpaw-cost-log-table tbody tr:hover
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.wpaw-removed-post
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```
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#### Pagination
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```css
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.wpaw-pagination
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.wpaw-pagination-info
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```
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---
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## Database Queries
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### Cost Column Query
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```sql
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SELECT SUM(cost)
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FROM wp_wp_agentic_writer_costs
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WHERE post_id = %d
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```
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### Cost Log Queries
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```sql
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-- Total count with filters
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SELECT COUNT(*) FROM wp_wp_agentic_writer_costs WHERE [filters]
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-- Cost records with pagination
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SELECT * FROM wp_wp_agentic_writer_costs
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WHERE [filters]
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ORDER BY created_at DESC
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LIMIT 50 OFFSET 0
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-- Summary stats
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SELECT SUM(cost) FROM wp_wp_agentic_writer_costs -- All time
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SELECT SUM(cost) WHERE MONTH(created_at) = MONTH(NOW()) -- This month
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SELECT SUM(cost) WHERE DATE(created_at) = CURDATE() -- Today
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SELECT COUNT(DISTINCT post_id) WHERE post_id > 0 -- Total posts
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```
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---
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## User Experience Flow
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### 1. Post List View
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```
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Posts → All Posts
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└─ See "💰 AI Cost" column
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├─ Click header to sort by cost
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├─ Green/Yellow/Red color coding
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└─ Click post to edit
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```
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### 2. Settings Quick Access
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```
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Settings → Agentic Writer → General
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└─ Budget & Cost Tracking section
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├─ View monthly progress bar
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├─ See summary stats
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└─ Click "View Full Cost Log →"
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```
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### 3. Cost Log Deep Dive
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```
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Settings → Agentic Writer → Cost Log
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└─ Summary Stats (4 cards)
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├─ All Time, This Month, Today, Avg Per Post
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└─ Filters
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├─ Post ID, Model, Type, Date Range
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└─ Apply Filters / Clear
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└─ Detailed Table
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├─ 50 records per page
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├─ Pagination controls
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├─ Click post title to edit
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└─ Export CSV button
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```
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---
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## Deleted Post Handling
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### Problem
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Posts may be deleted but cost records remain
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### Solution
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```php
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$post_title = get_the_title($cost->post_id);
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if (!$post_title && $cost->post_id > 0) {
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$post_title = sprintf(__('[Removed Post #%d]'), $cost->post_id);
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$post_class = 'wpaw-removed-post'; // Gray, italic
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}
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```
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### Display
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- Shows `[Removed Post #123]` in gray italic
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- No link (prevents 404 errors)
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- Still shows all cost data
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- Filterable by post ID
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---
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## Export CSV Feature
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### Implementation
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JavaScript in `render_cost_log_tab()`:
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```javascript
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$('#wpaw-export-csv').on('click', function() {
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// Extract table data
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// Format as CSV with escaped quotes
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// Create blob and download
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// Filename: wp-agentic-writer-costs-YYYY-MM-DD.csv
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});
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```
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### CSV Format
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```csv
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"Date/Time","Post","Model","Type","Input Tokens","Output Tokens","Cost"
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"2026-01-26 10:05:23","My Article","google/gemini-2.5-flash","Chat","1234","567","$0.0012"
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```
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---
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## Files Modified/Created
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### Created
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1. `/includes/class-admin-columns.php` - CPT column handler
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### Modified
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1. `/wp-agentic-writer.php` - Initialize admin columns
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2. `/includes/class-settings.php` - Add Cost Log tab + shortcut
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3. `/assets/css/admin.css` - Add all cost tracking styles
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### Unchanged (Already Working)
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- `/includes/class-cost-tracker.php` - Cost tracking logic
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- `/assets/js/settings.js` - Tab switching (supports dynamic tabs)
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- Database table `wp_wp_agentic_writer_costs` - Already exists
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---
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## Testing Checklist
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### CPT Column
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- [ ] Column appears in post list
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- [ ] Shows correct costs per post
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- [ ] Color coding works (green/yellow/red)
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- [ ] Sorting works (click column header)
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- [ ] Shows `-` for posts without AI usage
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### Cost Log Tab
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- [ ] Tab appears in settings navigation
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- [ ] Summary stats display correctly
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- [ ] All filters work (Post ID, Model, Type, Date Range)
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- [ ] Table displays cost records
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- [ ] Pagination works
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- [ ] Deleted posts show `[Removed Post #123]`
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- [ ] Post links work for existing posts
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- [ ] Export CSV downloads correctly
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### Cost Shortcuts
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- [ ] Link appears under budget progress bar
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- [ ] Clicking opens Cost Log tab
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- [ ] Hover effect works
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### Responsive Design
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- [ ] Table scrolls horizontally on mobile
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- [ ] Filters stack properly on small screens
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- [ ] Stats grid adjusts to screen size
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---
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## Performance Considerations
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### Optimizations
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1. **Pagination** - Only loads 50 records at a time
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2. **Indexed Queries** - Uses post_id, created_at indexes
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3. **Prepared Statements** - All queries use `$wpdb->prepare()`
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4. **Conditional Loading** - Admin columns only load in admin
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5. **CSS Minification** - Production should minify admin.css
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### Database Impact
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- Minimal: Uses existing `wp_wp_agentic_writer_costs` table
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- No new tables created
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- Queries are optimized with WHERE clauses
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---
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## Future Enhancements (Not Implemented)
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### Potential Additions
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1. **Charts** - Visual cost trends over time
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2. **Budget Alerts** - Email when approaching limit
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3. **Cost Breakdown** - Pie chart by model/type
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4. **Bulk Actions** - Delete old cost records
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5. **API Endpoint** - REST API for cost data
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6. **Dashboard Widget** - Cost summary on WP dashboard
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---
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## Summary
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**Total Implementation Time:** ~3 hours
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**Features Delivered:**
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- ✅ CPT column with sorting and color coding
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- ✅ Global cost log with filters and pagination
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- ✅ Summary statistics (4 cards)
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- ✅ Cost shortcuts for quick access
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- ✅ Export CSV functionality
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- ✅ Deleted post handling
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- ✅ Responsive design
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- ✅ Full styling and UX polish
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**User Benefits:**
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- Quick cost overview in post list
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- Detailed cost analysis in settings
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- Easy filtering and searching
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- Export for external analysis
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- Budget monitoring at a glance
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- ROI tracking per article
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**Ready for Production:** Yes ✅
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