Art4Hotel Hub: código + documentación extensiva

ERP a la medida (Python stdlib + SQLite + vanilla JS SPA).
Incluye server.py, index.html, utilidades y documentación:
README, MODELO_DATOS, API, INSTALACION, CONTEXTO, NEGOCIO,
WEB, ONBOARDING, VALOR_SISTEMA, CLAUDE.

Secretos y datos (art4hotel.db, secret.key, ACCESOS.html,
uploads/, backups/) excluidos vía .gitignore.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

fix_dup.py

@@ -0,0 +1,37 @@
+"""One-time: renumber duplicate orden_ids. Keep oldest row (lowest id) with original,
+rename later rows to MAX+1, MAX+2, ... Does NOT touch uploads/ folders — files stay
+attached to the original (lowest id) pedido, which is the desired behavior."""
+import sqlite3, sys
+
+DB = 'art4hotel.db'
+c = sqlite3.connect(DB)
+c.row_factory = sqlite3.Row
+
+dups = [r['orden_id'] for r in c.execute(
+    "SELECT orden_id FROM ordenes WHERE orden_id GLOB 'ORD-2026-[0-9][0-9][0-9]' "
+    "GROUP BY orden_id HAVING COUNT(*)>1")]
+print(f'Duplicados encontrados: {len(dups)}')
+
+max_num = c.execute(
+    "SELECT MAX(CAST(SUBSTR(orden_id,10,3) AS INTEGER)) FROM ordenes "
+    "WHERE orden_id GLOB 'ORD-2026-[0-9][0-9][0-9]'").fetchone()[0] or 0
+next_num = max_num + 1
+
+renames = []
+for oid in dups:
+    rows = c.execute("SELECT id, cliente, producto FROM ordenes WHERE orden_id=? ORDER BY id", (oid,)).fetchall()
+    keep = rows[0]
+    print(f"\n  {oid}  KEEP id={keep['id']} ({keep['cliente']} - {keep['producto']})")
+    for r in rows[1:]:
+        new_oid = f'ORD-2026-{next_num:03d}'
+        next_num += 1
+        print(f"      id={r['id']} ({r['cliente']} - {r['producto']})  →  {new_oid}")
+        renames.append((new_oid, r['id']))
+
+if '--apply' in sys.argv:
+    for new_oid, rid in renames:
+        c.execute("UPDATE ordenes SET orden_id=? WHERE id=?", (new_oid, rid))
+    c.commit()
+    print(f'\nAplicado: {len(renames)} renombrados.')
+else:
+    print(f'\n(dry-run — corre con --apply para aplicar {len(renames)} cambios)')