cpp/types/core/drill_step.md

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+---
+name: DrillStep
+lang: cpp
+domain: core
+version: "1.0.0"
+algebraic: product
+definition: |
+  struct DrillStep {
+      int     target_stage;
+      int     filter_pos;
+      int     prev_active_stage;
+      Filter  added;
+  };
+description: "Step de drill grabado para back/forward history (fase 10). apply_drill_step/undo_drill_step puras lo aplican/reversan."
+tags: [tql, drill, history, undo, product-type]
+uses_types: [Filter_cpp_core]
+file_path: "cpp/functions/core/data_table_types.h"
+---
+
+## Notas
+
+UI mantiene `vector<DrillStep>` back + forward stacks. Drill-down via click chart o tabla → push step a back, clear forward. Botones `<`/`>` en breadcrumb hacen pop+apply/undo.
+
+NO persistido en TQL — UI state efimero. Forward clear cuando hay nuevo drill (rama nueva).

cpp/types/core/filter_preset.md

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+---
+name: FilterPreset
+lang: cpp
+domain: core
+version: "1.0.0"
+algebraic: sum
+definition: |
+  enum class FilterPreset { Last7d, Last30d, Last90d, ExcludeNulls, NonZero };
+description: "Preset rapido de filter para chip row UI (fase 10). Genera 1-2 Filters via build_preset_filters(preset, col, today_ymd)."
+tags: [tql, filter, preset, sum-type]
+uses_types: []
+file_path: "cpp/functions/core/data_table_types.h"
+---
+
+## Notas
+
+| Preset | Filters generados |
+|---|---|
+| Last7/30/90d | Gte sobre col Date con (today_ymd - N) |
+| ExcludeNulls | Neq sobre col, value="" |
+| NonZero | Neq "" + Neq "0" (2 filters) |
+
+UI auto-pickea col compatible (Date para Last*d, numeric para NonZero, any para ExcludeNulls).