fix: move backfill logic to standalone script (fixes YAML parse error)

Inline Python with f-strings and colons broke Helm YAML parsing.
Moved to scripts/backfill_market_data.py and call it directly
from the init container command.

infra/helm/stonks-oracle/templates/deployments.yaml

@@ -93,62 +93,7 @@ spec:
         - name: backfill-market-data
           image: {{ $root.Values.image.registry }}/{{ $svc.image }}:{{ $root.Values.image.tag }}
           imagePullPolicy: {{ $root.Values.image.pullPolicy }}
-          command: ["sh", "-c"]
-          args:
-            - |
-              COUNT=$(PGPASSWORD="$POSTGRES_PASSWORD" psql \
-                -h "$POSTGRES_HOST" -p "$POSTGRES_PORT" \
-                -U "$POSTGRES_USER" -d "$POSTGRES_DB" \
-                -tAc "SELECT count(*) FROM market_snapshots WHERE snapshot_type = 'bar'" 2>/dev/null || echo "0")
-              if [ "$COUNT" -lt "50" ] && [ -n "$MARKET_DATA_API_KEY" ]; then
-                echo "Only $COUNT market bars found — backfilling 90 days from Polygon..."
-                python -c "
-import asyncio, asyncpg, hashlib, httpx, json, os
-from datetime import date, datetime, timedelta, timezone
-
-async def backfill():
-    api_key = os.environ.get('MARKET_DATA_API_KEY', '')
-    base_url = os.environ.get('MARKET_DATA_BASE_URL', 'https://api.polygon.io')
-    dsn = f'postgresql://{os.environ[\"POSTGRES_USER\"]}:{os.environ[\"POSTGRES_PASSWORD\"]}@{os.environ[\"POSTGRES_HOST\"]}:{os.environ[\"POSTGRES_PORT\"]}/{os.environ[\"POSTGRES_DB\"]}'
-    pool = await asyncpg.create_pool(dsn=dsn)
-    tickers = [r['ticker'] for r in await pool.fetch('SELECT ticker FROM companies WHERE active = TRUE ORDER BY ticker')]
-    to_d = date.today().isoformat()
-    from_d = (date.today() - timedelta(days=90)).isoformat()
-    total = 0
-    async with httpx.AsyncClient(timeout=30) as client:
-        for ticker in tickers:
-            url = f'{base_url}/v2/aggs/ticker/{ticker}/range/1/day/{from_d}/{to_d}'
-            try:
-                resp = await client.get(url, params={'apiKey': api_key, 'adjusted': 'true', 'sort': 'asc', 'limit': '500'})
-                resp.raise_for_status()
-                bars = resp.json().get('results', [])
-            except Exception as e:
-                print(f'  {ticker}: fetch failed ({e})')
-                continue
-            existing = {r['bar_ts'] for r in await pool.fetch(\"SELECT DISTINCT (data->>'t')::bigint AS bar_ts FROM market_snapshots WHERE ticker = \$1 AND snapshot_type = 'bar'\", ticker) if r['bar_ts']}
-            co = await pool.fetchrow('SELECT id FROM companies WHERE ticker = \$1', ticker)
-            cid = co['id'] if co else None
-            inserted = 0
-            for bar in bars:
-                bar_ts = bar.get('t')
-                if not bar_ts or bar_ts in existing:
-                    continue
-                bj = json.dumps(bar)
-                ch = hashlib.sha256(bj.encode()).hexdigest()
-                ca = datetime.fromtimestamp(bar_ts / 1000, tz=timezone.utc)
-                await pool.execute('INSERT INTO market_snapshots (company_id, ticker, snapshot_type, data, source_provider, captured_at, content_hash) VALUES (\$1, \$2, \'bar\', \$3::jsonb, \'polygon_backfill\', \$4, \$5)', cid, ticker, bj, ca, ch)
-                existing.add(bar_ts)
-                inserted += 1
-            total += inserted
-            if inserted:
-                print(f'  {ticker}: {inserted} bars')
-    await pool.close()
-    print(f'Backfill complete: {total} bars across {len(tickers)} tickers')
-asyncio.run(backfill())
-"
-              else
-                echo "Market data has $COUNT bars — skipping backfill."
-              fi
+          command: ["python", "/app/scripts/backfill_market_data.py"]
           securityContext:
             {{- include "stonks.containerSecurityContext" $root | nindent 12 }}
           envFrom: