From c2ad2e8d7de34b12571be479b6f3c8b59408cd11 Mon Sep 17 00:00:00 2001
From: Chris Amow <chris@amow.com>
Date: Wed, 26 Aug 2026 01:36:17 -0500
Subject: [PATCH] Stop rebuilding chart overlays on every live tick.

Ticks were force-redrawing trendline overlays and, in diagnostic mode,
sampling canvas pixels. That maxed CPU. Also document production log
and capture access for agents.
---
 AGENTS.md       | 29 +++++++++++++++++++++++++++++
 static/chart.js | 10 +---------
 2 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/AGENTS.md b/AGENTS.md
index 08d9193..b7dad2b 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -111,6 +111,35 @@ trendlines: historical/future canonical price changes, their screen slopes, and
 whether the future canvas point exists. Include it in a capture when a line
 looks kinked at the live edge; it separates bad geometry from a bad renderer.
 
+## Production logs and captures
+
+Do not ask the user to paste console output or screenshots when these work.
+This is not a production shell.
+
+```
+ssh -i ~/.ssh/chart_debug_ed25519 -o BatchMode=yes \
+  chart-debug@chart.amow.com 'logs --since 20m'
+ssh -i ~/.ssh/chart_debug_ed25519 -o BatchMode=yes \
+  chart-debug@chart.amow.com status
+ssh -i ~/.ssh/chart_debug_ed25519 -o BatchMode=yes \
+  chart-debug@chart.amow.com container-state
+ssh -i ~/.ssh/chart_debug_ed25519 -o BatchMode=yes \
+  chart-debug@chart.amow.com recent-deploy
+```
+
+Allowed commands only: `logs --since <Ns|Nm|Nh|Nd>`, `status`,
+`container-state`, `recent-deploy`, `capture-read c-…`,
+`capture-delete c-…`. Anything else is denied. Log output is redacted
+and capped. Never print tokens, env, or the private key.
+
+**Captures:** user opens `?diag=1`, hits Capture diagnostic (or
+`Alt+Shift+C`), and shares the PNG URL
+`https://chart.amow.com/api/debug/captures/{id}`. Inspect only a URL they
+explicitly share. Fetch the PNG (public by id), then immediately
+`DELETE` it — via that URL or
+`ssh … chart-debug@chart.amow.com 'capture-delete c-XXXXXXXXXXXX'`.
+Do not inspect unsolicited capture ids.
+
 ## Future whitespace is a high-risk boundary
 
 Drawing bugs repeatedly appear to the right of the last real candle. Treat any
diff --git a/static/chart.js b/static/chart.js
index a0e0901..a578c4b 100644
--- a/static/chart.js
+++ b/static/chart.js
@@ -811,7 +811,7 @@ class ConfluenceChart {
     else this.bars.push(bar);
     if (advanced) this.extendManualLineSeries(last, bar);
     if (advanced) this.syncRthLines();
-    this.scheduleOverlays(true);
+    if (advanced) this.scheduleOverlays(true);
   }
 
   extendManualLineSeries(previous, bar) {
@@ -2578,14 +2578,6 @@ class ConfluenceChart {
       `#${row.level.number} ${row.level.tf} dp ${((row.current.p ?? 0) - (row.previous.p ?? 0)).toFixed(3)}/${((row.next.p ?? 0) - (row.current.p ?? 0)).toFixed(3)} px ${(row.historical ?? 0).toFixed(3)}/${(row.future ?? 0).toFixed(3)} paint ${painted ? `${painted.historical?.toFixed(3) ?? '?'}/${painted.future?.toFixed(3) ?? '?'}` : '?/?'} ${row.series == null ? 'MISSING' : 'OK'}`;
     this.projectionDiagnostic.textContent = lines.map(row => text(row)).join('\n');
     this.projectionDiagnostic.hidden = !lines.length;
-    if (this.projectionDiagnosticFrame != null) cancelAnimationFrame(this.projectionDiagnosticFrame);
-    this.projectionDiagnosticFrame = requestAnimationFrame(() => {
-      this.projectionDiagnosticFrame = null;
-      this.projectionDiagnostic.textContent = lines.map(row => text(row, {
-        historical: this.paintedSlopeBetween(row.previous, row.current, ConfluenceChart.levelColor(row.level)),
-        future: this.paintedSlopeBetween(row.current, row.next, ConfluenceChart.levelColor(row.level)),
-      })).join('\n');
-    });
   }
 
   paintedSlopeBetween(first, second, color) {