diff --git a/docs/changelog-claude.md b/docs/changelog-claude.md
index a404e67..dade852 100644
--- a/docs/changelog-claude.md
+++ b/docs/changelog-claude.md
@@ -11,6 +11,7 @@ This file documents all changes made to this project via Claude Code.
 ### Changed
 - Changed `/jobs` route to accept optional `customer_id` query parameter and return only jobs for that customer when provided
 - Changed default Jobs listing behavior to keep existing inactive-customer filtering only when no `customer_id` filter is applied
+- Changed `docs/technical-notes-codex.md` with updated "Last updated" date, Customers→Jobs navigation notes, and test build/push validation snapshot
 
 ## [2026-02-13]
 
diff --git a/docs/technical-notes-codex.md b/docs/technical-notes-codex.md
index d1aedb2..01f8a96 100644
--- a/docs/technical-notes-codex.md
+++ b/docs/technical-notes-codex.md
@@ -1,6 +1,6 @@
 # Technical Notes (Internal)
 
-Last updated: 2026-02-13
+Last updated: 2026-02-16
 
 ## Purpose
 Internal technical snapshot of the `backupchecks` repository for faster onboarding, troubleshooting, and change impact analysis.
@@ -254,10 +254,28 @@ All pages use **explicit link-based queries** (no date-based logic):
 - Prevents browser from auto-selecting checkboxes after page reload
 - Fixes issue where deleting items would cause same number of new items to be selected
 
+### Customers to Jobs Navigation (2026-02-16)
+- Customers page links each customer name to filtered Jobs view:
+  - `GET /jobs?customer_id=<customer_id>`
+- Jobs route behavior:
+  - Accepts optional `customer_id` query parameter in `routes_jobs.py`.
+  - If set: returns jobs for that customer only.
+  - If not set: keeps default filter that hides jobs linked to inactive customers.
+- Jobs UI behavior:
+  - Shows active filter banner with selected customer name.
+  - Provides "Clear filter" action back to unfiltered `/jobs`.
+- Templates touched:
+  - `templates/main/customers.html`
+  - `templates/main/jobs.html`
+
 ## Feedback Module with Screenshots
 - Models: `FeedbackItem`, `FeedbackVote`, `FeedbackReply`, `FeedbackAttachment`.
 - Attachments:
   - multiple uploads, type validation, per-file size limits, storage in database (BYTEA).
+
+## Validation Snapshot
+- 2026-02-16: Test build + push succeeded via `update-and-build.sh t`.
+- Pushed image: `gitea.oskamp.info/ivooskamp/backupchecks:dev`.
 - Delete strategy:
   - soft delete by default,
   - permanent delete only for admins and only after soft delete.