diff --git a/docs_v1.0/DESIGN/FILE_LIFECYCLE_V1.0.md b/docs_v1.0/DESIGN/FILE_LIFECYCLE_V1.0.md
index d77d876..9e87817 100644
--- a/docs_v1.0/DESIGN/FILE_LIFECYCLE_V1.0.md
+++ b/docs_v1.0/DESIGN/FILE_LIFECYCLE_V1.0.md
@@ -2,7 +2,7 @@
 document_type: "design_doc"
 service: "MOMENTRY_CORE"
 title: "File Lifecycle — Pre-Processing & Registration"
-version: "V1.0"
+version: "V1.2"
 date: "2026-05-15"
 author: "M5"
 status: "draft"
@@ -14,7 +14,7 @@ status: "draft"
 |------|-------|
 | Scope | All managed file types (video, image, document, spreadsheet, presentation) |
 | Status | Draft |
-| Applies to | Watcher pre-processor + Register API |
+| Applies to | Pre-process API (explicit) + Register API |
 | Key concept | Two-phase flow: birth certificate (`.pre.json`) → civil registration (DB INSERT) |
 
 > **Applicable to all managed file types**: video, image, document (pdf, docx, pages, key, numbers), spreadsheet, presentation, and any other file registered in the system. The pre-processor registers any file type found by the watcher. ffprobe is used when applicable; files that ffprobe cannot parse receive minimal filesystem metadata as a fallback.
@@ -43,7 +43,7 @@ A file enters the system in two distinct phases:
 
 ### Trigger
 
-File watcher (`src/watcher/watcher.rs`) polls monitored directories every 60 seconds. When a new file is detected, pre-processor runs automatically.
+Pre-processing is triggered explicitly via the register API or a dedicated pre-process endpoint. It is NOT automatic — the watcher only detects new files without modifying them.
 
 ### Computation Steps
 
@@ -153,8 +153,9 @@ curl -X POST http://localhost:3002/api/v1/files/register \
 ## File Lifecycle State Diagram
 
 ```
-File detected by watcher
+File detected by watcher (detection only, no modification)
     │
+    │ Pre-processing triggered explicitly (API or register)
     ▼
 [Pre-Processor]
   ├─ SHA256 (DNA / fingerprint)
@@ -168,7 +169,7 @@ File detected by watcher
     │ (user calls POST /api/v1/files/register)
     ▼
 [Register Handler]
-  ├─ Read .pre.json (skip recomputation)
+  ├─ Read .pre.json → skip recomputation
   ├─ Dedup check (content_hash collision?)
   ├─ Name check + rename?
   └─ INSERT INTO videos
@@ -182,7 +183,7 @@ registration_time = NOW()
 
 | # | Task | File |
 |---|------|------|
-| 1 | Modify watcher pre-processor: SHA256 + probe + write `.pre.json` for all file types | `src/watcher/watcher.rs` |
+| 1 | Expose `pre_process_file()` as public function (SHA256 + probe + UUID → `.pre.json`) | `src/watcher/watcher.rs` |
 | 2 | Register: read `.pre.json`, skip SHA256/probe if cached | `src/api/server.rs` → `register_single_file` |
 | 3 | UUID: use `birthday` from `.pre.json` (or `fs::metadata().created()` fallback) | `src/api/server.rs` |
 | 4 | INSERT status: `registered`, registration_time: `NOW()` | `src/api/server.rs` |
@@ -194,3 +195,4 @@ registration_time = NOW()
 |---------|------|---------|
 | V1.0 | 2026-05-15 | Initial design — birth certificate (pre-process) + civil registration two-phase flow |
 | V1.1 | 2026-05-15 | Reclassified from DESIGN to STANDARDS as design standard |
+| V1.2 | 2026-05-15 | mtime replaces birthtime for UUID stability across rsync; watcher is detection-only |