backend: dedupe shared logic (indicator_summary_job, CHAT_REFERENCE_LINE, call_openrouter alias)

- indicator_summary_job.py imported its own copies of _month_spend and
  _latest_quotes_by_group; _market_context.py already exposes these.
  Switched to the canonical imports. Also fixed _market_context's
  latest_quotes_by_group to actually filter null prices (it claimed to
  in its docstring but lacked the WHERE clause).
- api.py duplicated REFERENCE_LINE as CHAT_REFERENCE_LINE — same string,
  two sources of truth. Now imports REFERENCE_LINE.
- Chat endpoint used the deprecated `call_openrouter` alias and passed
  an explicit `model=` that bypassed the provider chain. Switched to
  `call_llm` with default model selection, then removed the alias.

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

app/jobs/_market_context.py

@@ -42,6 +42,7 @@ async def latest_quotes_by_group(session) -> dict[str, list[dict]]:
             & (Quote.symbol == sub.c.symbol)
             & (Quote.fetched_at == sub.c.mx),
         )
+        .where(Quote.price.is_not(None))
         .order_by(Quote.group_name, Quote.symbol)
     )
     rows = (await session.execute(stmt)).scalars().all()

app/jobs/indicator_summary_job.py

@@ -5,7 +5,6 @@ from __future__ import annotations
 
 import asyncio
 import re
-from collections import defaultdict
 
 import httpx
 from sqlalchemy import desc, func, select
@@ -13,7 +12,8 @@ from sqlalchemy import desc, func, select
 from app.config import get_settings, load_groups
 from app.db import utcnow
 from app.jobs._helpers import job_lifecycle, log
-from app.models import AICall, IndicatorSummary, JobRun, Quote
+from app.jobs._market_context import latest_quotes_by_group, month_spend
+from app.models import AICall, IndicatorSummary, JobRun
 from app.services.cadence import DEFAULT_POLICY
 from app.services.openrouter import (
     PROMPT_VERSION,
@@ -136,40 +136,6 @@ def clean_summary(text: str) -> str:
     return out
 
 
-async def _latest_quotes_by_group(session) -> dict[str, list[dict]]:
-    """Latest non-null quote per (group, symbol). Drops error rows."""
-    sub = (
-        select(Quote.group_name, Quote.symbol,
-               func.max(Quote.fetched_at).label("mx"))
-        .group_by(Quote.group_name, Quote.symbol)
-        .subquery()
-    )
-    rows = (await session.execute(
-        select(Quote).join(
-            sub,
-            (Quote.group_name == sub.c.group_name)
-            & (Quote.symbol == sub.c.symbol)
-            & (Quote.fetched_at == sub.c.mx),
-        ).where(Quote.price.is_not(None))
-        .order_by(Quote.group_name, Quote.symbol)
-    )).scalars().all()
-    by_group: dict[str, list[dict]] = defaultdict(list)
-    for q in rows:
-        by_group[q.group_name].append({
-            "symbol": q.symbol, "label": q.label,
-            "price": q.price, "currency": q.currency,
-            "as_of": q.as_of, "changes": q.changes,
-        })
-    return by_group
-
-
-async def _month_spend(session) -> float:
-    total = (await session.execute(
-        select(func.coalesce(func.sum(AICall.cost_usd), 0.0))
-        .where(AICall.called_at >= month_start())
-    )).scalar()
-    return float(total or 0.0)
-
 
 async def _generate_one(
     session, client: httpx.AsyncClient, group: str, quotes: list[dict],
@@ -254,13 +220,13 @@ async def run() -> None:
             jr.error = reason
             return
 
-        spent = await _month_spend(session)
+        spent = await month_spend(session)
         if spent >= s.OPENROUTER_MONTHLY_CAP_USD:
             jr.status = "skipped"
             jr.error = f"monthly cap reached (${spent:.2f})"
             return
 
-        groups = await _latest_quotes_by_group(session)
+        groups = await latest_quotes_by_group(session)
         # Only summarise groups currently configured in TOML — drops stale
         # group names (e.g. an old "pie" before T212 sourcing) that still have
         # quotes in the table but no UI presence.