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feat: add shared pathway query functions for Dash data access (Task 1.1)

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Extract load_data() and load_pathway_data() logic from Reflex AppState
into standalone functions in src/data_processing/pathway_queries.py.
Create thin dash_app/data/queries.py wrapper with DB_PATH resolution.
This commit is contained in:
Andrew Charlwood
2026-02-06 13:02:34 +00:00
parent 1c3ece6480
commit b71748fa7d
4 changed files with 331 additions and 5 deletions
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IMPLEMENTATION_PLAN.md
+4 -4
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@@ -98,12 +98,12 @@ Drawer selection → update_drug_selection → app-state store → load_pathway_
## Phase 1: Data Access Layer
### 1.1 Create shared data access functions
- [ ] Add query functions to `src/data_processing/database.py` (or a new `src/data_processing/pathway_queries.py` if database.py is already large):
- [x] Add query functions to `src/data_processing/pathway_queries.py`:
- `load_initial_data(db_path) -> dict` — extracted from `AppState.load_data()` (pathways_app.py lines 407-488): returns `{"available_drugs": [...], "available_directorates": [...], "available_indications": [...], "total_records": int, "last_updated": str}`
- `load_pathway_data(db_path, filter_id, chart_type, selected_drugs=None, selected_directorates=None) -> dict` — extracted from `AppState.load_pathway_data()` (lines 490-642): returns `{"nodes": [...], "unique_patients": int, "total_drugs": int, "total_cost": float, "last_updated": str}`
- `load_pathway_nodes(db_path, filter_id, chart_type, selected_drugs=None, selected_directorates=None) -> dict` — extracted from `AppState.load_pathway_data()` (lines 490-642): returns `{"nodes": [...], "unique_patients": int, "total_drugs": int, "total_cost": float, "last_updated": str}`
- These are plain Python functions that accept `db_path` as a parameter (no Reflex state objects)
- [ ] Create thin `dash_app/data/queries.py` that imports and calls the shared functions with the correct `db_path`
- [ ] Return plain dicts/lists — JSON-serializable for dcc.Store
- [x] Create thin `dash_app/data/queries.py` that imports and calls the shared functions with the correct `db_path`
- [x] Return plain dicts/lists — JSON-serializable for dcc.Store
- **Checkpoint**: `python -c "from dash_app.data.queries import load_initial_data; print(load_initial_data())"` returns valid data
### 1.2 Build directorate card tree from DimSearchTerm.csv