diff --git a/docs/SESSION_2026-01-04_HST.md b/docs/SESSION_2026-01-04_HST.md
index 96fe74f..218b083 100644
--- a/docs/SESSION_2026-01-04_HST.md
+++ b/docs/SESSION_2026-01-04_HST.md
@@ -98,3 +98,70 @@ Sesión de mantenimiento y backup del sistema HST de tags semánticos en servido
 | Base de datos | hst_images |
 | R2 Endpoint | https://7dedae6030f5554d99d37e98a5232996.r2.cloudflarestorage.com |
 | Bucket | architect |
+
+---
+
+## Cambios en Esquema de Base de Datos
+
+### Renombrado de Campos (Español → Inglés)
+
+| Antes | Después | Tablas |
+|-------|---------|--------|
+| nombre_es | name_es | todas (8) |
+| nombre_en | name_en | todas (8) |
+| nombre_ch | name_ch | todas (8) |
+| estandar_md | standard_md | hst, flg |
+| estandar_data | standard_data | ply, itm, loc, mst, bck, mth |
+| grupo | group | hst, flg, ply |
+| mrf_padre | mrf_parent | tree_hst, tree_flg |
+| mrf_hijo | mrf_child | tree_hst, tree_flg |
+| mrf_biblioteca | mrf_library | library_hst, library_flg |
+
+### Campos Legacy Eliminados
+
+| Tabla | Campos eliminados |
+|-------|-------------------|
+| ply | nombre_fiscal, codigo_fiscal, telefono, email, direccion_fiscal, numero_cuenta, descripcion_modelo |
+| itm | grupo, ref_supplier, moq, lote, embalaje, unidad, coste, iva, delivery_time, specs |
+| loc | grupo, localizacion_url, direccion, telefono |
+
+### Backups Generados
+
+- `/hst/bases/*.sql` - 26 tablas (servidor local)
+- `R2: documentos adjuntos/backups/260104_v3_all_tables.tar.gz`
+- `R2: documentos adjuntos/TZZR_Database_Spec_v2.md`
+
+### Esquema Final v2
+
+| hst | flg | ply | itm | loc | mst | bck | mth |
+|-----|-----|-----|-----|-----|-----|-----|-----|
+| num | num | num | num | num | num | num | num |
+| alias | alias | alias | alias | alias | alias | alias | alias |
+| ref | ref | ref | ref | ref | ref | ref | ref |
+| mrf | mrf | mrf | mrf | mrf | mrf | mrf | mrf |
+| private_mrf | private_mrf | private_mrf | private_mrf | private_mrf | private_mrf | private_mrf | private_mrf |
+| name_es | name_es | name_es | name_es | name_es | name_es | name_es | name_es |
+| name_en | name_en | name_en | name_en | name_en | name_en | name_en | name_en |
+| name_ch | name_ch | name_ch | name_ch | name_ch | name_ch | name_ch | name_ch |
+| group | group | group | - | - | - | - | - |
+| - | - | - | set_hst | set_hst | set_hst | set_hst | set_hst |
+| - | - | - | - | - | link_mst | link_mst | - |
+| - | - | - | - | - | link_bck | link_bck | - |
+| txt | txt | txt | txt | txt | txt | txt | txt |
+| - | - | hashtags | hashtags | hashtags | hashtags | hashtags | hashtags |
+| standard_md | standard_md | - | - | - | - | - | - |
+| - | - | standard_data | standard_data | standard_data | standard_data | standard_data | standard_data |
+| jsonb_standard | jsonb_standard | - | - | - | - | - | - |
+| - | - | jsonb_data | jsonb_data | jsonb_data | jsonb_data | jsonb_data | jsonb_data |
+| version | version | version | version | version | version | version | version |
+| rootref | rootref | rootref | rootref | rootref | rootref | rootref | rootref |
+| roothash | roothash | roothash | roothash | roothash | roothash | roothash | roothash |
+| img_url | img_url | img_url | img_url | img_url | img_url | img_url | img_url |
+| owner | owner | owner | owner | owner | owner | owner | owner |
+| - | - | set_flg | set_flg | set_flg | set_flg | set_flg | set_flg |
+| url | url | url | url | url | - | - | - |
+| - | - | - | url_atc | - | url_atc | url_atc | url_atc |
+| url_json | url_json | url_json | url_json | url_json | url_json | url_json | url_json |
+| date | date | date | date | date | date | date | date |
+| created_at | created_at | created_at | created_at | created_at | created_at | created_at | created_at |
+| - | - | - | - | - | mth_mrf | mth_mrf | - |