refactor: address architect review findings (6 items)

R1: Extend @safe to catch ValueError->400, simplify routes_backtest
    (eliminated 4 copies of duplicated try/except)
R2: Consolidate PROVIDER constant into obb_utils.py (single source)
R3: Add days_ago() helper to obb_utils.py, replace 8+ duplications
R4: Extract Reddit/ApeWisdom into reddit_service.py from finnhub_service
R5: Fix missing top-level import asyncio in finnhub_service
R6: (deferred - sentiment logic extraction is a larger change)

All 561 tests passing.

reddit_service.py

@@ -0,0 +1,80 @@
+"""Reddit stock sentiment via ApeWisdom API (free, no key needed)."""
+
+import logging
+from typing import Any
+
+import httpx
+
+logger = logging.getLogger(__name__)
+
+APEWISDOM_URL = "https://apewisdom.io/api/v1.0/filter/all-stocks/page/1"
+TIMEOUT = 10.0
+
+
+async def get_reddit_sentiment(symbol: str) -> dict[str, Any]:
+    """Get Reddit sentiment for a symbol.
+
+    Tracks mentions and upvotes across r/wallstreetbets, r/stocks, r/investing.
+    """
+    try:
+        async with httpx.AsyncClient(timeout=TIMEOUT) as client:
+            resp = await client.get(APEWISDOM_URL)
+            resp.raise_for_status()
+            data = resp.json()
+            results = data.get("results", [])
+
+            match = next(
+                (r for r in results if r.get("ticker", "").upper() == symbol.upper()),
+                None,
+            )
+            if match is None:
+                return {
+                    "symbol": symbol,
+                    "found": False,
+                    "message": f"{symbol} not in Reddit top trending (not enough mentions)",
+                }
+
+            mentions_prev = match.get("mentions_24h_ago", 0)
+            mentions_now = match.get("mentions", 0)
+            change_pct = (
+                round((mentions_now - mentions_prev) / mentions_prev * 100, 1)
+                if mentions_prev > 0
+                else None
+            )
+            return {
+                "symbol": symbol,
+                "found": True,
+                "rank": match.get("rank"),
+                "mentions_24h": mentions_now,
+                "mentions_24h_ago": mentions_prev,
+                "mentions_change_pct": change_pct,
+                "upvotes": match.get("upvotes"),
+                "rank_24h_ago": match.get("rank_24h_ago"),
+            }
+    except Exception:
+        logger.warning("Reddit sentiment failed for %s", symbol, exc_info=True)
+        return {"symbol": symbol, "error": "Failed to fetch Reddit sentiment"}
+
+
+async def get_reddit_trending() -> list[dict[str, Any]]:
+    """Get top trending stocks on Reddit (free, no key)."""
+    try:
+        async with httpx.AsyncClient(timeout=TIMEOUT) as client:
+            resp = await client.get(APEWISDOM_URL)
+            resp.raise_for_status()
+            data = resp.json()
+            return [
+                {
+                    "rank": r.get("rank"),
+                    "symbol": r.get("ticker"),
+                    "name": r.get("name"),
+                    "mentions_24h": r.get("mentions"),
+                    "upvotes": r.get("upvotes"),
+                    "rank_24h_ago": r.get("rank_24h_ago"),
+                    "mentions_24h_ago": r.get("mentions_24h_ago"),
+                }
+                for r in data.get("results", [])[:25]
+            ]
+    except Exception:
+        logger.warning("Reddit trending failed", exc_info=True)
+        return []