1 files changed, 30 insertions, 7 deletions
diff --git a/web-timeplot/ARCHITECTURE.md b/web-timeplot/ARCHITECTURE.md
index 1cfc3f1..73c4cb6 100644
--- a/web-timeplot/ARCHITECTURE.md
+++ b/web-timeplot/ARCHITECTURE.md
@@ -12,6 +12,8 @@ The restarted TimePlot app is built around five small systems:
 
 The current implementation is intentionally compact, but each system is already separated enough to grow without turning the app into a monolith again.
 
+Core workspace configuration is also persisted in `localStorage`, so plot settings, routing, and source setup survive reloads without persisting transient runtime state.
+
 ## Runtime flow
 
 ```text
@@ -21,7 +23,7 @@ Store.time updated
     ↓
 SourceRegistry.update(plotTime)
     ↓
-SyntheticWaveSource emits samples
+Synthetic / CSV replay / WebSocket sources emit samples
     ↓
 PlotBuffer stores bounded history
     ↓
@@ -80,12 +82,24 @@ The plot is GPU-rendered with PixiJS. Controls, labels, and config panels stay i
     hoveredPoint,
     tooltip,
   },
-  source: {
-    activeId,
-    preset,
-    sampleRateHz,
-    amplitude,
-    noise,
+  sources: {
+    signalA: {
+      type,
+      preset,
+      sampleRateHz,
+      amplitude,
+      noise,
+      replayRate,
+      wsUrl,
+      wsReconnectMs,
+    },
+    signalB: {
+      ...
+    },
+  },
+  graphs: {
+    primary: { sourceKey, transform, title },
+    secondary: { sourceKey, transform, title },
   },
   panels: {
     status,
@@ -119,6 +133,14 @@ Generates sample streams from a preset waveform. Right now it supports:
 - `chirp`
 - `burst`
 
+### `src/data/csv-replay-source.js`
+
+Replays uploaded CSV datasets on the shared plot timebase.
+
+### `src/data/websocket-source.js`
+
+Streams live samples from a WebSocket server and reconnects automatically.
+
 ### `src/plot/plot-buffer.js`
 
 Maintains bounded history so rendering and hover picking only operate on a manageable number of samples.
@@ -147,6 +169,7 @@ The old project had useful ideas but too many concerns were mixed together. The
 - data generation is separate from app wiring
 - UI is separate from GPU drawing
 - state is centralized and observable
+- persisted configuration is separated from transient runtime state
 - adding a new source or panel no longer requires rewriting the whole app
 
 ## Recommended next steps