feat(macro): Macro Vibes — 8-indicator daily snapshot + composite score

New backend pipeline: 8 free public macro signals fetched in parallel,
upserted once per calendar day, served via /api/macro/{snapshot,history}.

  - AHR999 (computed from Binance 200d klines)
  - Altcoin Season Index (CoinGecko top-50 30d)
  - Fear & Greed (alternative.me)
  - BTC dominance, ETH/BTC ratio
  - Stablecoin supply (DeFiLlama)
  - Spot BTC ETF net flow (Farside)
  - BTC perp open interest (Binance fapi)

Each fetcher is independently @_none_on_fail decorated so one outage
can't take down the snapshot; scoring renormalises across whichever
indicators returned a value. Daily cron at 03:00 UTC; on startup a
fire-and-forget bootstrap fills today's row if missing.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/main.py

@@ -28,6 +28,7 @@ from app.api.signals import router as signals_router
 from app.api.positions import router as positions_router
 from app.api.scanners  import router as scanners_router
 from app.api.kol       import router as kol_router
+from app.api.macro     import router as macro_router
 
 logging.basicConfig(
     level=logging.INFO,
@@ -176,6 +177,38 @@ async def lifespan(app: FastAPI):
     )
     logger.info("KOL divergence scan scheduled daily at 02:15 UTC.")
 
+    # ── Macro indicator daily snapshot ────────────────────────────────────
+    # 8 indicators (AHR999, Fear & Greed, BTC dominance, ETH/BTC, stablecoin
+    # supply, ETF flow, BTC OI, altcoin season). One row per calendar date.
+    # Runs after KOL jobs so a slow KOL fetch can't make this one miss.
+    from app.services.macro.poll import run_macro_poll
+    _scheduler.add_job(
+        run_macro_poll, "cron", hour=3, minute=0,
+        id="macro_poll", max_instances=1, coalesce=True,
+    )
+    logger.info("Macro indicator snapshot scheduled daily at 03:00 UTC.")
+
+    # Kick off an initial poll on startup IF today's row doesn't exist yet.
+    # Otherwise a fresh deploy shows an empty macro panel until 03:00 UTC of
+    # the next day. Fire-and-forget — never blocks startup.
+    async def _macro_bootstrap():
+        try:
+            from datetime import datetime, timezone
+            from sqlalchemy import select
+            from app.models import MacroSnapshot
+            today = datetime.now(timezone.utc).date()
+            async with AsyncSessionLocal() as db:
+                exists = (await db.execute(
+                    select(MacroSnapshot).where(MacroSnapshot.snapshot_date == today)
+                )).scalar_one_or_none()
+            if exists is None:
+                logger.info("Macro: no row for today, running one-shot bootstrap fetch.")
+                await run_macro_poll()
+        except Exception as exc:
+            logger.warning("Macro bootstrap fetch failed: %s (%s)",
+                           type(exc).__name__, exc)
+    asyncio.create_task(_macro_bootstrap())
+
     _scheduler.start()
     logger.info(
         "Truth Social pollers scheduled every %ds (CNN + trumpstruth.org).",
@@ -254,6 +287,7 @@ app.include_router(signals_router,        prefix="/api")
 app.include_router(positions_router,      prefix="/api")
 app.include_router(scanners_router,       prefix="/api")
 app.include_router(kol_router,             prefix="/api")
+app.include_router(macro_router,           prefix="/api")
 
 
 @app.get("/api/health")