Architecture diagram: current main, timeline histogram

- Title without the commit hash (the hand-drawn font turned "32593b9" into
  "3259369"); the subtitle dates the diagram instead.
- New Histogram (histogram.go) box: API -> histogram -> VictoriaLogs (stats).
- Query mentions the from/to range (zoom); the web UI mentions the
  timeline, columns and live view.
- Multi-segment arrows drawn straight, routed between the containers.
- PNG regenerated from the .excalidraw source (Excalidraw 0.18 renderer).
- README: histogram.go in the Search flow.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

README.md

@@ -18,7 +18,8 @@ devices ──514 udp/tcp──▶ logstream (Go) ──HTTP batches──▶ Vi
   on IP hosts), then the `Store` queue, which sends them in batches to VictoriaLogs.
 - **Live view**: `sink()` also publishes each message to the `Hub`, which streams it to the
   browsers over SSE.
-- **Search**: the HTTP API turns the UI filters into LogsQL queries sent to VictoriaLogs.
+- **Search**: the HTTP API turns the UI filters into LogsQL queries sent to VictoriaLogs;
+  `histogram.go` computes the timeline intervals (division, time zone, count per severity).
 - **State**: tags and source settings live in `/data` (`logstream-data` volume); the logs
   themselves in the `vlogs-data` volume.
 

docs/logstream-schema-logique.excalidraw

@@ -8,7 +8,7 @@
    "type": "text",
    "x": 380,
    "y": -40,
-   "width": 638,
+   "width": 403.0,
    "height": 35.0,
    "angle": 0,
    "strokeColor": "#1e1e1e",
@@ -29,8 +29,8 @@
    "updated": 1759385400000,
    "link": null,
    "locked": false,
-   "text": "LogStream : schéma logique (commit 32593b9)",
+   "text": "LogStream : schéma logique",
-   "originalText": "LogStream : schéma logique (commit 32593b9)",
+   "originalText": "LogStream : schéma logique",
    "fontSize": 28,
    "fontFamily": 1,
    "textAlign": "left",
@@ -44,7 +44,7 @@
    "type": "text",
    "x": 380,
    "y": 0,
-   "width": 836,
+   "width": 991.6,
    "height": 20.0,
    "angle": 0,
    "strokeColor": "#757575",
@@ -65,8 +65,8 @@
    "updated": 1759385400000,
    "link": null,
    "locked": false,
-   "text": "Go stdlib, binaire unique, UI embarquée ; stockage VictoriaLogs ; déploiement docker compose (3 services)",
+   "text": "État de main au 02/10/2026 · Go stdlib, binaire unique, UI embarquée ; stockage VictoriaLogs ; déploiement docker compose (3 services)",
-   "originalText": "Go stdlib, binaire unique, UI embarquée ; stockage VictoriaLogs ; déploiement docker compose (3 services)",
+   "originalText": "État de main au 02/10/2026 · Go stdlib, binaire unique, UI embarquée ; stockage VictoriaLogs ; déploiement docker compose (3 services)",
    "fontSize": 16,
    "fontFamily": 1,
    "textAlign": "left",
@@ -955,6 +955,10 @@
     {
      "type": "arrow",
      "id": "a_nav"
+    },
+    {
+     "type": "arrow",
+     "id": "a_ah"
     }
    ],
    "updated": 1759385400000,
@@ -1001,9 +1005,9 @@
    "id": "query",
    "type": "rectangle",
    "x": 900,
-   "y": 520,
+   "y": 515,
    "width": 240,
-   "height": 90,
+   "height": 100,
    "angle": 0,
    "strokeColor": "#8b5cf6",
    "backgroundColor": "#d0bfff",
@@ -1042,10 +1046,10 @@
   {
    "id": "query_lbl",
    "type": "text",
-   "x": 937.5,
+   "x": 937.05,
-   "y": 535.0,
+   "y": 525.0,
-   "width": 165,
+   "width": 165.9,
-   "height": 60.0,
+   "height": 80.0,
    "angle": 0,
    "strokeColor": "#1e1e1e",
    "backgroundColor": "transparent",
@@ -1065,8 +1069,8 @@
    "updated": 1759385400000,
    "link": null,
    "locked": false,
-   "text": "Query\nfiltres UI → LogsQL\nMatcher (filtre live)",
+   "text": "Query\nfiltres UI → LogsQL\nMatcher (filtre live)\nplage from/to (zoom)",
-   "originalText": "Query\nfiltres UI → LogsQL\nMatcher (filtre live)",
+   "originalText": "Query\nfiltres UI → LogsQL\nMatcher (filtre live)\nplage from/to (zoom)",
    "fontSize": 16,
    "fontFamily": 1,
    "textAlign": "center",
@@ -1075,6 +1079,253 @@
    "lineHeight": 1.25,
    "autoResize": true
   },
+  {
+   "id": "hist",
+   "type": "rectangle",
+   "x": 900,
+   "y": 650,
+   "width": 250,
+   "height": 90,
+   "angle": 0,
+   "strokeColor": "#8b5cf6",
+   "backgroundColor": "#d0bfff",
+   "fillStyle": "solid",
+   "strokeWidth": 2,
+   "strokeStyle": "solid",
+   "roughness": 1,
+   "opacity": 100,
+   "groupIds": [],
+   "frameId": null,
+   "roundness": {
+    "type": 3
+   },
+   "seed": 771234567,
+   "version": 1,
+   "versionNonce": 1234987,
+   "isDeleted": false,
+   "boundElements": [
+    {
+     "type": "text",
+     "id": "hist_lbl"
+    },
+    {
+     "type": "arrow",
+     "id": "a_ah"
+    },
+    {
+     "type": "arrow",
+     "id": "a_hv"
+    }
+   ],
+   "updated": 1759385400000,
+   "link": null,
+   "locked": false
+  },
+  {
+   "id": "hist_lbl",
+   "type": "text",
+   "x": 918.35,
+   "y": 665.0,
+   "width": 213.3,
+   "height": 60.0,
+   "angle": 0,
+   "strokeColor": "#1e1e1e",
+   "backgroundColor": "transparent",
+   "fillStyle": "solid",
+   "strokeWidth": 2,
+   "strokeStyle": "solid",
+   "roughness": 1,
+   "opacity": 100,
+   "groupIds": [],
+   "frameId": null,
+   "roundness": null,
+   "seed": 771234568,
+   "version": 1,
+   "versionNonce": 1234988,
+   "isDeleted": false,
+   "boundElements": [],
+   "updated": 1759385400000,
+   "link": null,
+   "locked": false,
+   "text": "Histogram (histogram.go)\npas auto/fixe ≤ 300 interv.\nfuseau, détail par sévérité",
+   "originalText": "Histogram (histogram.go)\npas auto/fixe ≤ 300 interv.\nfuseau, détail par sévérité",
+   "fontSize": 16,
+   "fontFamily": 1,
+   "textAlign": "center",
+   "verticalAlign": "middle",
+   "containerId": "hist",
+   "lineHeight": 1.25,
+   "autoResize": true
+  },
+  {
+   "id": "a_ah",
+   "type": "arrow",
+   "x": 860,
+   "y": 695,
+   "width": 40,
+   "height": 0,
+   "angle": 0,
+   "strokeColor": "#22c55e",
+   "backgroundColor": "transparent",
+   "fillStyle": "solid",
+   "strokeWidth": 2,
+   "strokeStyle": "solid",
+   "roughness": 1,
+   "opacity": 100,
+   "groupIds": [],
+   "frameId": null,
+   "roundness": {
+    "type": 2
+   },
+   "seed": 771234569,
+   "version": 1,
+   "versionNonce": 1234989,
+   "isDeleted": false,
+   "boundElements": [],
+   "updated": 1759385400000,
+   "link": null,
+   "locked": false,
+   "points": [
+    [
+     0,
+     0
+    ],
+    [
+     40,
+     0
+    ]
+   ],
+   "lastCommittedPoint": null,
+   "startArrowhead": null,
+   "endArrowhead": "arrow",
+   "elbowed": false,
+   "startBinding": {
+    "elementId": "api",
+    "focus": 0,
+    "gap": 4,
+    "fixedPoint": [
+     1,
+     0.875
+    ]
+   },
+   "endBinding": {
+    "elementId": "hist",
+    "focus": 0,
+    "gap": 4,
+    "fixedPoint": [
+     0,
+     0.5
+    ]
+   }
+  },
+  {
+   "id": "a_hv",
+   "type": "arrow",
+   "x": 1150,
+   "y": 695,
+   "width": 110,
+   "height": 360,
+   "angle": 0,
+   "strokeColor": "#0f9f8f",
+   "backgroundColor": "transparent",
+   "fillStyle": "solid",
+   "strokeWidth": 2,
+   "strokeStyle": "solid",
+   "roughness": 1,
+   "opacity": 100,
+   "groupIds": [],
+   "frameId": null,
+   "roundness": null,
+   "seed": 771234570,
+   "version": 1,
+   "versionNonce": 1234990,
+   "isDeleted": false,
+   "boundElements": [
+    {
+     "type": "text",
+     "id": "a_hv_lbl"
+    }
+   ],
+   "updated": 1759385400000,
+   "link": null,
+   "locked": false,
+   "points": [
+    [
+     0,
+     0
+    ],
+    [
+     72,
+     0
+    ],
+    [
+     72,
+     -360
+    ],
+    [
+     110,
+     -360
+    ]
+   ],
+   "lastCommittedPoint": null,
+   "startArrowhead": null,
+   "endArrowhead": "arrow",
+   "elbowed": false,
+   "startBinding": {
+    "elementId": "hist",
+    "focus": 0,
+    "gap": 4,
+    "fixedPoint": [
+     1,
+     0.5
+    ]
+   },
+   "endBinding": {
+    "elementId": "vl",
+    "focus": 0,
+    "gap": 4,
+    "fixedPoint": [
+     0,
+     0.97
+    ]
+   }
+  },
+  {
+   "id": "a_hv_lbl",
+   "type": "text",
+   "x": 1204.7,
+   "y": 551.25,
+   "width": 34.6,
+   "height": 17.5,
+   "angle": 0,
+   "strokeColor": "#0f9f8f",
+   "backgroundColor": "transparent",
+   "fillStyle": "solid",
+   "strokeWidth": 2,
+   "strokeStyle": "solid",
+   "roughness": 1,
+   "opacity": 100,
+   "groupIds": [],
+   "frameId": null,
+   "roundness": null,
+   "seed": 771234571,
+   "version": 1,
+   "versionNonce": 1234991,
+   "isDeleted": false,
+   "boundElements": [],
+   "updated": 1759385400000,
+   "link": null,
+   "locked": false,
+   "text": "stats",
+   "originalText": "stats",
+   "fontSize": 14,
+   "fontFamily": 1,
+   "textAlign": "center",
+   "verticalAlign": "middle",
+   "containerId": "a_hv",
+   "lineHeight": 1.25,
+   "autoResize": true
+  },
   {
    "id": "tags",
    "type": "rectangle",
@@ -1157,9 +1408,9 @@
    "id": "ui",
    "type": "rectangle",
    "x": 340,
-   "y": 660,
+   "y": 655,
    "width": 230,
-   "height": 80,
+   "height": 95,
    "angle": 0,
    "strokeColor": "#22c55e",
    "backgroundColor": "#b2f2bb",
@@ -1194,10 +1445,10 @@
   {
    "id": "ui_lbl",
    "type": "text",
-   "x": 372.0,
+   "x": 372.05,
-   "y": 670.0,
+   "y": 662.5,
-   "width": 166,
+   "width": 165.9,
-   "height": 60.0,
+   "height": 80.0,
    "angle": 0,
    "strokeColor": "#1e1e1e",
    "backgroundColor": "transparent",
@@ -1217,8 +1468,8 @@
    "updated": 1759385400000,
    "link": null,
    "locked": false,
-   "text": "UI web embarquée\ngo:embed web/\nHTML/CSS/JS vanilla",
+   "text": "UI web embarquée\ngo:embed web/\nHTML/CSS/JS vanilla\nfrise, colonnes, live",
-   "originalText": "UI web embarquée\ngo:embed web/\nHTML/CSS/JS vanilla",
+   "originalText": "UI web embarquée\ngo:embed web/\nHTML/CSS/JS vanilla\nfrise, colonnes, live",
    "fontSize": 16,
    "fontFamily": 1,
    "textAlign": "center",
@@ -1332,6 +1583,10 @@
     {
      "type": "arrow",
      "id": "a_vd"
+    },
+    {
+     "type": "arrow",
+     "id": "a_hv"
     }
    ],
    "updated": 1759385400000,
@@ -2490,9 +2745,7 @@
    "opacity": 100,
    "groupIds": [],
    "frameId": null,
-   "roundness": {
+   "roundness": null,
-    "type": 2
-   },
    "seed": 656439678,
    "version": 1,
    "versionNonce": 1605947757,
@@ -2512,12 +2765,12 @@
      0
     ],
     [
-     60,
+     55,
-     0.0
+     0
     ],
     [
-     60,
+     55,
-     -250.0
+     -250
     ],
     [
      120,
@@ -2550,7 +2803,7 @@
   {
    "id": "a_q_lbl",
    "type": "text",
-   "x": 1175.5,
+   "x": 1170.5,
    "y": 431.25,
    "width": 49,
    "height": 17.5,
@@ -2661,9 +2914,7 @@
    "opacity": 100,
    "groupIds": [],
    "frameId": null,
-   "roundness": {
+   "roundness": null,
-    "type": 2
-   },
    "seed": 83651971,
    "version": 1,
    "versionNonce": 480468220,
@@ -3097,9 +3348,7 @@
    "opacity": 100,
    "groupIds": [],
    "frameId": null,
-   "roundness": {
+   "roundness": null,
-    "type": 2
-   },
    "seed": 1817363616,
    "version": 1,
    "versionNonce": 909666338,