feat: dynamic market ticker watchlist (Markets page)

Add ability to add/remove custom tickers (e.g. EURCHF=X) on the
Markets & Prices page without editing config. Tickers are validated
via yfinance, persisted in market_watchlist SQLite table, merged into
the quotes feed as a 'custom' group, and shown in a dedicated tab
with per-card remove buttons.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/routers/market_data.py

@@ -39,6 +39,38 @@ def watchlist():
     return WATCHLIST
 
 
+@router.get("/custom-tickers")
+def list_custom_tickers():
+    from services.database import get_market_custom_tickers
+    return get_market_custom_tickers()
+
+
+@router.post("/custom-tickers/{ticker}")
+def add_custom_ticker(ticker: str):
+    from services.data_fetcher import get_quote
+    from services.database import add_market_custom_ticker
+    import yfinance as yf
+    ticker = ticker.strip().upper()
+    q = get_quote(ticker)
+    if not q or not q.get("price"):
+        from fastapi import HTTPException
+        raise HTTPException(400, f"Ticker '{ticker}' not found on yfinance")
+    try:
+        info = yf.Ticker(ticker).fast_info
+        name = getattr(info, "long_name", None) or getattr(info, "short_name", None) or ticker
+    except Exception:
+        name = ticker
+    add_market_custom_ticker(ticker, name)
+    return {"ticker": ticker, "name": name, "price": q["price"]}
+
+
+@router.delete("/custom-tickers/{ticker}")
+def remove_custom_ticker(ticker: str):
+    from services.database import remove_market_custom_ticker
+    remove_market_custom_ticker(ticker.strip().upper())
+    return {"removed": ticker.upper()}
+
+
 @router.get("/validate")
 def validate_ticker(symbol: str = Query(..., description="Ticker to validate against yfinance")):
     """Check if a ticker is fetchable. Returns valid=True + live price/name, or valid=False + reason."""

backend/services/data_fetcher.py

@@ -136,6 +136,24 @@ def get_all_quotes() -> Dict[str, List[Dict[str, Any]]]:
                 q["asset_class"] = asset_class
                 quotes.append(q)
         result[asset_class] = quotes
+
+    # User-added custom tickers
+    try:
+        from services.database import get_market_custom_tickers
+        custom_entries = get_market_custom_tickers()
+        if custom_entries:
+            custom_quotes = []
+            for entry in custom_entries:
+                q = get_quote(entry["ticker"])
+                if q:
+                    q["name"] = entry["name"] or entry["ticker"]
+                    q["asset_class"] = "custom"
+                    custom_quotes.append(q)
+            if custom_quotes:
+                result["custom"] = custom_quotes
+    except Exception:
+        pass
+
     return result
 
 

backend/services/database.py

@@ -91,6 +91,12 @@ def init_db():
         # Regime / counter-scenario architecture
         "ALTER TABLE custom_patterns ADD COLUMN regime_tag TEXT",
         "ALTER TABLE custom_patterns ADD COLUMN counter_of TEXT",
+        # Markets & Prices — user-defined watchlist
+        """CREATE TABLE IF NOT EXISTS market_watchlist (
+            ticker TEXT PRIMARY KEY,
+            name TEXT,
+            added_at TEXT DEFAULT (datetime('now'))
+        )""",
     ]:
         try:
             c.execute(_sql)
@@ -2307,6 +2313,42 @@ def remove_watchlist_ticker(ticker: str) -> bool:
     return changed
 
 
+# ── Market Watchlist (user-added tickers for Markets page) ───────────────────
+
+def get_market_custom_tickers() -> List[Dict]:
+    conn = get_conn()
+    rows = conn.execute(
+        "SELECT ticker, name, added_at FROM market_watchlist ORDER BY added_at ASC"
+    ).fetchall()
+    conn.close()
+    return [dict(r) for r in rows]
+
+
+def add_market_custom_ticker(ticker: str, name: str = "") -> bool:
+    conn = get_conn()
+    try:
+        conn.execute(
+            "INSERT OR IGNORE INTO market_watchlist (ticker, name) VALUES (?, ?)",
+            (ticker.upper(), name),
+        )
+        inserted = conn.total_changes > 0
+        conn.commit()
+    except Exception:
+        inserted = False
+    finally:
+        conn.close()
+    return inserted
+
+
+def remove_market_custom_ticker(ticker: str) -> bool:
+    conn = get_conn()
+    conn.execute("DELETE FROM market_watchlist WHERE ticker=?", (ticker.upper(),))
+    changed = conn.total_changes > 0
+    conn.commit()
+    conn.close()
+    return changed
+
+
 # ── System Logs ───────────────────────────────────────────────────────────────
 
 def log_system_event(