feat: Focus mode, estimates/burndown+budget alerts, recurring blocks, saved filters, and rate overrides

Add Pomodoro focus mode with session summaries
Model: FocusSession; API: /api/focus-sessions/; UI: Focus modal on timer page
Add estimates vs actuals with burndown and budget alerts
Project fields: estimated_hours, budget_amount, budget_threshold_percent
API: /api/projects/<id>/burndown; Charts in project view and project report
Implement recurring time blocks/templates
Model: RecurringBlock; API CRUD: /api/recurring-blocks; CLI: flask generate_recurring
Add tagging and saved filters across views
Model: SavedFilter; /api/entries supports tag and saved_filter_id
Support billable rate overrides per project/member
Model: RateOverride; invoicing uses effective rate resolution
Also:
Migration: 016_add_focus_recurring_rates_filters_and_project_budget.py
Integrations and UI updates in projects view, timer page, and reports
Docs updated (startup, invoice, task mgmt) and README feature list
Added basic tests for new features

docs/ENHANCED_DATABASE_STARTUP.md

@@ -33,6 +33,10 @@ This script provides comprehensive database setup:
 - `settings` - Application configuration and company branding
 - `invoices` - Invoice management
 - `invoice_items` - Individual invoice line items
+ - `focus_sessions` - Pomodoro/focus session summaries linked to `time_entries`
+ - `recurring_blocks` - Templates for recurring time blocks to auto-create entries
+ - `rate_overrides` - Per-project and per-user billable rate overrides
+ - `saved_filters` - User-defined saved filters payloads for reusable queries
 
 #### Key Features
 

docs/INVOICE_INTERFACE_IMPROVEMENTS.md

@@ -115,6 +115,12 @@ The invoice feature interface has been significantly improved to provide a more
 
 ## Technical Improvements
 
+### **Effective Rate Resolution**
+- Invoices generated from time entries now use a precedence order for hourly rates:
+  1) project+user `rate_overrides` record; 2) project-only `rate_overrides` record;
+  3) `Project.hourly_rate`; 4) `Client.default_hourly_rate`.
+- This allows granular billable rate overrides per project/member.
+
 ### **CSS Enhancements**
 - Modern shadow system with `shadow-sm` and `border-0`
 - Consistent spacing using Bootstrap utilities

docs/TASK_MANAGEMENT.md

@@ -168,6 +168,14 @@ If you encounter database-related errors:
 3. Verify all required tables exist
 4. Contact system administrator if issues persist
 
+## Recurring Time Blocks
+
+The system supports recurring time block templates via the `recurring_blocks` table.
+
+- Fields: `name`, `recurrence` (weekly), `weekdays` (e.g., `mon,tue`), `start_time_local`, `end_time_local`, optional `starts_on`/`ends_on`.
+- Blocks can include `notes`, `tags`, and `billable` flag and are user-owned.
+- API endpoints allow CRUD operations; a scheduler can periodically expand these into concrete `time_entries`.
+
 ## Future Enhancements
 
 Planned improvements for Task Management: