Merge DEV: v1.2.6 — non-destructive rescan, Fable/Mythos+Opus-4.8 pricing, June 2026 dates, CI action bumps

Release boundary for v1.2.6. See CHANGELOG.md for the full set of changes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: phuryn

.github/workflows/extension-ci.yml

@@ -20,9 +20,9 @@ jobs:
         working-directory: vscode-extension
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v5
         with:
           node-version: "20"
           cache: "npm"
@@ -40,7 +40,7 @@ jobs:
         run: npm run package
 
       - name: Upload .vsix artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: claude-usage-extension-vsix
           path: vscode-extension/*.vsix

.github/workflows/tag-on-merge.yml

@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           # Need enough history to diff the whole push range (`before..after`)
           # not just the tip commit. fetch-depth: 0 = full clone; small repo,
@@ -103,7 +103,7 @@ jobs:
 
       - name: Set up Node (to build the .vsix)
         if: steps.detect.outputs.version != ''
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v5
         with:
           node-version: "20"
           cache: "npm"

.github/workflows/tests.yml

@@ -14,10 +14,10 @@ jobs:
         python-version: ["3.9", "3.11", "3.12"]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
 

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## v1.2.6 — 2026-06-15
+
+### Dashboard
+
+- Added an explicit `claude-opus-4-8` entry to both pricing tables and pointed the generic `opus` fallback at it (was 4.7). 4.8 already costed correctly via the substring fallback — this guards against silent mis-costing if 4.8 is ever repriced, and keeps the catch-all on the newest Opus (#133, #134, thanks @Ninhache).
+- Added the `claude-fable-5`, `claude-mythos-5`, and `claude-opus-4-8` rows to the README cost table (they were already in the live CLI/dashboard tables) and listed `fable` / `mythos` in the README's "included models" note, so the docs match the code.
+- Unified the pricing "as of" date to **June 2026** everywhere — the dashboard footer, the in-chart cost sublabel, the pricing code comment, and the README were inconsistently labelled April/May.
+- Made the Rescan button non-destructive: `/api/rescan` now runs an incremental scan instead of deleting `usage.db` and rebuilding from scratch. `usage.db` is the only durable record of usage once Claude Code prunes old transcripts (`cleanupPeriodDays`), so the old wipe-and-rebuild could permanently lose history that was no longer on disk. The button stays (it's the only in-session way to ingest new turns); its tooltip now reflects the additive behaviour (#138, thanks @OtoGodfrey).
+
+### Project / docs
+
+- Bumped GitHub Actions to their Node 24-era major versions across all workflows (`actions/checkout@v5`, `actions/setup-node@v5`, `actions/setup-python@v6`, `actions/upload-artifact@v5`), ahead of GitHub forcing Node 24 on the runners (Node 20 actions are deprecated from 2026-06-16).
+
 ## v1.2.5 — 2026-06-15
 
 ### Scanner / CLI

README.md

@@ -113,12 +113,15 @@ Claude Code writes one JSONL file per session to `~/.claude/projects/`. Each lin
 
 ## Cost estimates
 
-Costs are calculated using **Anthropic API pricing as of April 2026** ([claude.com/pricing#api](https://claude.com/pricing#api)).
+Costs are calculated using **Anthropic API pricing as of June 2026** ([claude.com/pricing#api](https://claude.com/pricing#api)).
 
-**Only models whose name contains `opus`, `sonnet`, or `haiku` are included in cost calculations.** Local models, unknown models, and any other model names are excluded (shown as `n/a`).
+**Only models whose name contains `fable`, `mythos`, `opus`, `sonnet`, or `haiku` are included in cost calculations.** Local models, unknown models, and any other model names are excluded (shown as `n/a`).
 
 | Model | Input | Output | Cache Write | Cache Read |
 |-------|-------|--------|------------|-----------|
+| claude-fable-5 | $10.00/MTok | $50.00/MTok | $12.50/MTok | $1.00/MTok |
+| claude-mythos-5 | $10.00/MTok | $50.00/MTok | $12.50/MTok | $1.00/MTok |
+| claude-opus-4-8 | $5.00/MTok | $25.00/MTok | $6.25/MTok | $0.50/MTok |
 | claude-opus-4-7 | $5.00/MTok | $25.00/MTok | $6.25/MTok | $0.50/MTok |
 | claude-opus-4-6 | $5.00/MTok | $25.00/MTok | $6.25/MTok | $0.50/MTok |
 | claude-sonnet-4-6 | $3.00/MTok | $15.00/MTok | $3.75/MTok | $0.30/MTok |

cli.py

@@ -21,6 +21,7 @@
     # (Mythos 5 shares Fable 5's pricing; Project-Glasswing access only.)
     "claude-fable-5":    {"input": 10.00, "output": 50.00, "cache_read": 1.00, "cache_write": 12.50},
     "claude-mythos-5":   {"input": 10.00, "output": 50.00, "cache_read": 1.00, "cache_write": 12.50},
+    "claude-opus-4-8":   {"input": 5.00, "output": 25.00, "cache_read": 0.50, "cache_write": 6.25},
     "claude-opus-4-7":   {"input": 5.00, "output": 25.00, "cache_read": 0.50, "cache_write": 6.25},
     "claude-opus-4-6":   {"input": 5.00, "output": 25.00, "cache_read": 0.50, "cache_write": 6.25},
     "claude-opus-4-5":   {"input": 5.00, "output": 25.00, "cache_read": 0.50, "cache_write": 6.25},
@@ -45,7 +46,7 @@ def get_pricing(model):
     if "fable" in m or "mythos" in m:
         return PRICING["claude-fable-5"]
     if "opus" in m:
-        return PRICING["claude-opus-4-7"]
+        return PRICING["claude-opus-4-8"]
     if "sonnet" in m:
         return PRICING["claude-sonnet-4-6"]
     if "haiku" in m:

dashboard.py

@@ -269,7 +269,7 @@ def get_dashboard_data(db_path=DB_PATH):
     <h1>Claude Code Usage</h1>
   </div>
   <div class="meta" id="meta">Loading...</div>
-  <button id="rescan-btn" onclick="triggerRescan()" title="Rebuild the database from scratch by re-scanning all JSONL files. Use if data looks stale or costs seem wrong.">&#x21bb; Rescan</button>
+  <button id="rescan-btn" onclick="triggerRescan()" title="Scan for new usage since the last update. Adds new turns without affecting existing history.">&#x21bb; Rescan</button>
 </header>
 
 <div id="filter-bar">
@@ -390,7 +390,7 @@ def get_dashboard_data(db_path=DB_PATH):
 
 <footer>
   <div class="footer-content">
-    <p>Cost estimates based on Anthropic API pricing (<a href="https://claude.com/pricing#api" target="_blank">claude.com/pricing#api</a>) as of May 2026. Only models containing <em>fable</em>, <em>mythos</em>, <em>opus</em>, <em>sonnet</em>, or <em>haiku</em> in the name are included in cost calculations. Actual costs for Max/Pro subscribers differ from API pricing.</p>
+    <p>Cost estimates based on Anthropic API pricing (<a href="https://claude.com/pricing#api" target="_blank">claude.com/pricing#api</a>) as of June 2026. Only models containing <em>fable</em>, <em>mythos</em>, <em>opus</em>, <em>sonnet</em>, or <em>haiku</em> in the name are included in cost calculations. Actual costs for Max/Pro subscribers differ from API pricing.</p>
     <p>
       GitHub: <a href="https://github.com/phuryn/claude-usage" target="_blank">https://github.com/phuryn/claude-usage</a>
       &nbsp;&middot;&nbsp;
@@ -487,12 +487,13 @@ def get_dashboard_data(db_path=DB_PATH):
   }
 }
 
-// ── Pricing (Anthropic API, April 2026) ────────────────────────────────────
+// ── Pricing (Anthropic API, June 2026) ─────────────────────────────────────
 const PRICING = {
   // Fable / Mythos — Anthropic's most capable class, priced at 2x Opus.
   // (Mythos 5 shares Fable 5's pricing; Project-Glasswing access only.)
   'claude-fable-5':    { input: 10.00, output: 50.00, cache_write: 12.50, cache_read: 1.00 },
   'claude-mythos-5':   { input: 10.00, output: 50.00, cache_write: 12.50, cache_read: 1.00 },
+  'claude-opus-4-8':   { input:  5.00, output: 25.00, cache_write:  6.25, cache_read: 0.50 },
   'claude-opus-4-7':   { input:  5.00, output: 25.00, cache_write:  6.25, cache_read: 0.50 },
   'claude-opus-4-6':   { input:  5.00, output: 25.00, cache_write:  6.25, cache_read: 0.50 },
   'claude-opus-4-5':   { input:  5.00, output: 25.00, cache_write:  6.25, cache_read: 0.50 },
@@ -519,7 +520,7 @@ def get_dashboard_data(db_path=DB_PATH):
   }
   const m = model.toLowerCase();
   if (m.includes('fable') || m.includes('mythos')) return PRICING['claude-fable-5'];
-  if (m.includes('opus'))   return PRICING['claude-opus-4-7'];
+  if (m.includes('opus'))   return PRICING['claude-opus-4-8'];
   if (m.includes('sonnet')) return PRICING['claude-sonnet-4-6'];
   if (m.includes('haiku'))  return PRICING['claude-haiku-4-5'];
   return null;
@@ -920,7 +921,7 @@ def get_dashboard_data(db_path=DB_PATH):
     { label: 'Output Tokens',  value: fmt(t.output),               sub: rangeLabel },
     { label: 'Cache Read',     value: fmt(t.cache_read),           sub: 'from prompt cache' },
     { label: 'Cache Creation', value: fmt(t.cache_creation),       sub: 'writes to prompt cache' },
-    { label: 'Est. Cost',      value: fmtCostBig(t.cost),          sub: 'API pricing, May 2026', color: C.green },
+    { label: 'Est. Cost',      value: fmtCostBig(t.cost),          sub: 'API pricing, June 2026', color: C.green },
   ];
   document.getElementById('stats-row').innerHTML = stats.map(s => `
     <div class="stat-card">
@@ -1544,14 +1545,15 @@ def do_GET(self):
     def do_POST(self):
         path = urlparse(self.path).path
         if path == "/api/rescan":
-            # Full rebuild: delete DB and rescan from scratch.
+            # Incremental scan: ingest new/changed JSONL without touching
+            # existing rows. The DB is append-only and the only durable store
+            # of history once Claude Code prunes old transcripts, so we must
+            # never delete it here — scan() dedupes via the message_id index.
             # Pass DB_PATH / DEFAULT_PROJECTS_DIRS explicitly so tests that
             # patch the module globals are honored (scan's defaults are
             # frozen at def time and would otherwise target the real paths).
             import scanner
             db_path = DB_PATH
-            if db_path.exists():
-                db_path.unlink()
             result = scanner.scan(
                 db_path=db_path,
                 projects_dirs=scanner.DEFAULT_PROJECTS_DIRS,

tests/test_cli.py

@@ -15,13 +15,47 @@ def test_exact_model_match(self):
         self.assertEqual(p["output"], 25.00)
 
     def test_all_known_models_have_pricing(self):
-        for model in ("claude-opus-4-7", "claude-opus-4-6", "claude-opus-4-5",
+        for model in ("claude-fable-5", "claude-mythos-5",
+                       "claude-opus-4-8", "claude-opus-4-7", "claude-opus-4-6", "claude-opus-4-5",
                        "claude-sonnet-4-7", "claude-sonnet-4-6", "claude-sonnet-4-5",
                        "claude-haiku-4-7", "claude-haiku-4-6", "claude-haiku-4-5"):
             p = get_pricing(model)
             self.assertGreater(p["input"], 0, f"Missing input price for {model}")
             self.assertGreater(p["output"], 0, f"Missing output price for {model}")
 
+    def test_fable_and_mythos_have_explicit_entries(self):
+        """Regression guard for #136/#137 — Fable 5 and Mythos 5 must be priced
+        explicitly at 2x Opus, not fall through to $0/n/a or an Opus rate."""
+        for model in ("claude-fable-5", "claude-mythos-5"):
+            self.assertIn(model, PRICING)
+            p = get_pricing(model)
+            self.assertEqual(p["input"], 10.00, f"{model} input price wrong")
+            self.assertEqual(p["output"], 50.00, f"{model} output price wrong")
+            self.assertEqual(p["cache_read"], 1.00, f"{model} cache_read wrong")
+            self.assertEqual(p["cache_write"], 12.50, f"{model} cache_write wrong")
+
+    def test_fable_date_suffix_matches(self):
+        """JSONL model strings may carry a date suffix."""
+        p = get_pricing("claude-fable-5-20260601")
+        self.assertEqual(p["input"], 10.00)
+        self.assertEqual(p["output"], 50.00)
+
+    def test_substring_match_fable_and_mythos(self):
+        """Unknown future fable/mythos variants resolve to Fable pricing,
+        not the generic opus/sonnet/haiku rates or n/a."""
+        for model in ("some-fable-variant", "internal-mythos-test"):
+            p = get_pricing(model)
+            self.assertEqual(p["input"], 10.00, f"{model} should map to Fable pricing")
+            self.assertEqual(p["output"], 50.00, f"{model} should map to Fable pricing")
+
+    def test_opus_4_8_has_explicit_entry(self):
+        """Regression guard for issue #133 — Opus 4.8 must be present, not just
+        resolved via the generic 'opus' substring fallback."""
+        self.assertIn("claude-opus-4-8", PRICING)
+        p = get_pricing("claude-opus-4-8")
+        self.assertEqual(p["input"], 5.00)
+        self.assertEqual(p["output"], 25.00)
+
     def test_opus_4_7_has_explicit_entry(self):
         """Regression guard for issue #61 — Opus 4.7 must be present."""
         p = get_pricing("claude-opus-4-7")

tests/test_dashboard.py

@@ -255,8 +255,8 @@ class TestDashboardHTTP(unittest.TestCase):
     @classmethod
     def setUpClass(cls):
         # Redirect DB_PATH + projects dirs to a tempdir so /api/rescan
-        # doesn't unlink the user's real ~/.claude/usage.db or scan their
-        # real transcript directory during tests.
+        # writes to a throwaway DB and scans a throwaway transcript dir
+        # instead of the user's real ~/.claude/usage.db and transcripts.
         import dashboard as _d
         import scanner as _s
         cls._tmpdir = tempfile.TemporaryDirectory()
@@ -328,6 +328,53 @@ def test_api_rescan_returns_json(self):
             self.assertIn("updated", data)
             self.assertIn("skipped", data)
 
+    def test_api_rescan_is_non_destructive(self):
+        # Regression (#138): /api/rescan must NOT wipe the DB. usage.db is the
+        # only durable store of history once Claude Code prunes old transcripts
+        # (cleanupPeriodDays), so a rescan with nothing left on disk must keep
+        # the existing rows. Seed history that has no corresponding JSONL file
+        # (the projects dir is empty), rescan, and assert it survives.
+        import dashboard as _d
+        db_path = _d.DB_PATH
+        conn = get_db(db_path)
+        init_db(conn)
+        upsert_sessions(conn, [{
+            "session_id": "pruned-sess", "project_name": "user/oldproject",
+            "first_timestamp": "2026-01-01T09:00:00Z",
+            "last_timestamp": "2026-01-01T10:00:00Z",
+            "git_branch": "main", "model": "claude-opus-4-8",
+            "total_input_tokens": 1000, "total_output_tokens": 400,
+            "total_cache_read": 0, "total_cache_creation": 0,
+            "turn_count": 1,
+        }])
+        insert_turns(conn, [{
+            "session_id": "pruned-sess", "timestamp": "2026-01-01T09:30:00Z",
+            "model": "claude-opus-4-8", "input_tokens": 1000,
+            "output_tokens": 400, "cache_read_tokens": 0,
+            "cache_creation_tokens": 0, "tool_name": None, "cwd": "/tmp",
+            "message_id": "msg-pruned-1",
+        }])
+        conn.commit()
+        conn.close()
+
+        url = f"http://127.0.0.1:{self.port}/api/rescan"
+        req = urllib.request.Request(url, method="POST")
+        with urllib.request.urlopen(req) as resp:
+            self.assertEqual(resp.status, 200)
+
+        conn = sqlite3.connect(db_path)
+        try:
+            turn_count = conn.execute(
+                "SELECT COUNT(*) FROM turns WHERE session_id = 'pruned-sess'"
+            ).fetchone()[0]
+            sess_count = conn.execute(
+                "SELECT COUNT(*) FROM sessions WHERE session_id = 'pruned-sess'"
+            ).fetchone()[0]
+        finally:
+            conn.close()
+        self.assertEqual(turn_count, 1, "rescan must not delete existing turns")
+        self.assertEqual(sess_count, 1, "rescan must not delete existing sessions")
+
     def test_404_for_unknown_path(self):
         url = f"http://127.0.0.1:{self.port}/nonexistent"
         try:

vscode-extension/README.md

@@ -54,7 +54,7 @@ Open the Command Palette (`Ctrl+Shift+P` / `Cmd+Shift+P`):
 | Command | What it does |
 |---|---|
 | **Claude Usage: Open Dashboard** | Reveal the sidebar and start the server (also fires automatically when you click the activity-bar icon) |
-| **Claude Usage: Rescan Transcripts** | Refresh the iframe; the dashboard's own Rescan button triggers a full DB rebuild |
+| **Claude Usage: Rescan Transcripts** | Refresh the iframe; the dashboard's own Rescan button runs an incremental scan that adds new usage without touching existing history |
 | **Claude Usage: Restart Server** | Kill and respawn the Python process (use after changing settings) |
 | **Claude Usage: Show Logs** | Open the extension's output channel — useful when something doesn't work |