Drop fact_interventions (440K rows), mv_patient_treatment_summary (35K rows),
ref_drug_snomed_mapping (144K rows), and processed_files — all unused since
the app moved to pre-computed pathway_nodes.
Key changes:
- Rewrite load_data() to source from pathway_nodes + pathway_refresh_log
- Remove 7 dead methods and 8 dead state vars from pathways_app.py
- Delete patient_data.py, load_snomed_mapping.py, test_large_dataset_performance.py
- Remove SQLiteDataLoader (depended on fact_interventions)
- Remove file tracking schema (processed_files tracked fact_interventions loads)
- Remove legacy diagnosis functions from diagnosis_lookup.py
- Add source_row_count migration for pathway_refresh_log
- Clean all cross-references in __init__.py, data_source.py, migrate.py
- Add selected_chart_type state variable and set_chart_type() handler
- Add chart_type filter to load_pathway_data() WHERE clause
- Create segmented control toggle component in filter strip
- Add dynamic hierarchy label (Directorate vs Indication)
- Update chart title to include chart type prefix
- Add subtle hover states to KPI badges, dropdown triggers, tabs
- Add consistent focus rings for accessibility (2px Pale Blue)
- Update button styles with focus/active states
- Clean up unused styles: compact_kpi_* (Option B), unused imports
- All interactive elements now have appropriate hover/focus feedback
- Use top_bar_style() for 48px height container
- Use logo_style() for 28px height logo (was 36px)
- Use top_bar_tab_style() for 28px height pills
- Simplify data freshness to single line
- Remove max_width constraint for full-width bar
- Lighter shadow (SM instead of MD)
- Remove PAGE_MAX_WIDTH constraint from main_content()
- Update chart_display() with calc(100vh - 152px) height
- Update icicle_figure with autosize=True and reduced margins
- Update chart_section() with flex layout for height fill
- Update page_layout() with 100vh height
- Add kpi_badge() and kpi_badges() functions for inline pill-style KPIs
- Integrate KPI badges into filter_section() on the right side
- Remove separate kpi_row() from main_content() layout
- Zero extra vertical height - KPIs now share the filter strip row
Design: Follows Option A from DESIGN_SYSTEM.md (preferred approach)
- Created initiated_filter_dropdown() and last_seen_filter_dropdown() components
- Uses rx.select.root pattern with static options for Reflex compatibility
- Updated filter_section() to use new dropdown components
- Removed old date_range_picker() function (replaced by new dropdowns)
- Data freshness indicator already working in top_bar via load_pathway_data()
- Verified: py_compile PASS, imports PASS, reflex compile PASS (11.1s)
Updated the icicle_figure computed property in AppState to use the full
10-field customdata structure matching visualization/plotly_generator.py:
- value (patient count)
- colour (proportion of parent)
- cost (total cost)
- costpp (cost per patient)
- first_seen (first intervention date)
- last_seen (last intervention date)
- first_seen_parent (earliest date in parent)
- last_seen_parent (latest date in parent)
- average_spacing (dosing information)
- cost_pp_pa (cost per patient per annum)
Updated texttemplate and hovertemplate to display treatment statistics
including duration, dosing, and full cost breakdown.
- Add dropdown state for date filters (selected_initiated, selected_last_seen)
- Add date_filter_id computed property combining the two selections
- Add load_pathway_data() method to query pathway_nodes table
- Add recalculate_parent_totals() for filtered hierarchies
- Update all filter handlers to call load_pathway_data()
- Update KPI calculations from root node data
Phase 3 Reflex integration: Task 3.1 complete
- Update pathways_app/__init__.py to re-export app from app_v2
- Verified reflex run compiles 33/33 components successfully
- App runs on localhost:3003 (frontend) and :8002 (backend)
- Mark completion criteria "App compiles" as verified
- Replace chart_ready_placeholder() with chart_display() function
- chart_display() wraps rx.plotly() with AppState.icicle_figure
- Chart updates reactively when filters change via computed property
- Loading, error, and empty states already handled in chart_section()
- Add prepare_chart_data() method for hierarchical chart data
- Build Trust → Directory → Drug hierarchy from filtered SQLite data
- Calculate patient counts and costs at each hierarchy level
- Compute color values (proportions) for visualization
- Generate dynamic chart title based on filter state
- Call prepare_chart_data() from apply_filters() for reactivity
- Mark Task 3.4 complete (KPIs implemented in apply_filters)
- Add apply_filters() method that queries SQLite with current filter state
- Handle initiated date filter (first intervention date range)
- Handle last seen date filter (last intervention date range)
- Handle drug and directorate multi-select filters
- Use CTE pattern for efficient patient-level date filtering
- Update KPI values (unique_patients, total_drugs, total_cost) on filter change
- Call apply_filters() from all filter event handlers
- Call apply_filters() after initial data load
- Add load_data() method to AppState that connects to SQLite database
- Populate available_drugs, available_directorates, available_indications from DB
- Detect latest date in dataset and set filter defaults accordingly
- Load KPI values: total_records, unique_patients, total_drugs, total_cost
- Add on_load handler to trigger data loading on page initialization
- Handle database errors gracefully with meaningful error messages
- Add datetime imports for date handling
- Add data state variables: last_updated, raw_data, latest_date_in_data
- Set last_seen date defaults (6 months ago to today)
- Add last_updated_display computed var for top bar
- Update top bar to show dynamic refresh timestamp
- Add chart_loading_skeleton() with animated bar chart and spinner
- Add chart_error_state() for displaying errors with guidance
- Add chart_empty_state() for when filters yield no results
- Add chart_ready_placeholder() for Phase 4 Plotly integration
- Rewrite chart_section() with 4-state rx.cond() logic
- Fix icon names (triangle-alert) and color references (SLATE_500)
This completes Phase 2 Layout Components.
- Create kpi_card() component with icon, value, label, and highlight option
- Create kpi_row() with 4 KPI cards: Unique Patients, Drug Types, Total Cost, Indication Match
- Add computed vars for formatted KPI display values
- Add placeholder KPI state variables (unique_patients, total_drugs, total_cost, indication_match_rate)
- Use design system tokens for styling with hover effects
- Responsive flex-wrap layout for smaller screens
- Add date_range_picker() component with enable/disable checkbox
- Add searchable_dropdown() component with search, select all, clear
- Implement filter_section() with layout for dates and multi-selects
- Add comprehensive state management in AppState:
- Filter toggle states (initiated_filter_enabled, last_seen_filter_enabled)
- Date values for both ranges
- Dropdown visibility state
- Selection state for drugs, indications, directorates
- Search text state for filtering options
- Event handlers for all filter interactions
- Computed vars for filtered options and selection counts
- Style components using design tokens from styles.py
- Debounced handlers deferred to Phase 3.3 (Filter Logic)
- Add chart_tab() component for chart type pills
- Implement full top_bar() with logo, title, chart tabs, data freshness
- Heritage Blue background with white text, 64px fixed height
- Reactive data freshness indicator using rx.cond for loading states
- Added Transitions import to styles
- Add app_v2.py with basic Reflex app structure
- AppState class with placeholder state variables
- Layout components: top_bar, filter_section, kpi_row, chart_section
- Page layout matching DESIGN_SYSTEM.md structure
- Theme configured with design system colors
- Google Fonts for Inter and JetBrains Mono
- Add Colors class with NHS-inspired blue palette and neutrals
- Add Typography class with font family, sizes, weights
- Add Spacing, Radii, Shadows, Transitions classes
- Add helper functions: card_style(), button_*_style(), input_style()
- Add KPI card and text style helpers
- Add layout constants (TOP_BAR_HEIGHT, PAGE_MAX_WIDTH)
All tokens match DESIGN_SYSTEM.md specifications.
Andrew Charlwood