Andrew Charlwood 19607d72b0 feat: add chart_type column to pathway_nodes schema (Task 2.2) ...

- Add chart_type column (TEXT NOT NULL DEFAULT 'directory')
- Update UNIQUE constraint to (date_filter_id, chart_type, ids)
- Add idx_pathway_nodes_chart_type index for filtering
- Add migrate_pathway_nodes_chart_type() function for existing databases
- Update initialize_database() to run migration automatically
- Existing rows default to 'directory' chart type

2026-02-05 14:24:57 +00:00

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