initial commit — cassandra v0.1

Containerised macro-strategy dashboard: 4-panel web UI (indicators,
portfolio, flash news, AI strategic log), MariaDB store, hourly
ingestion jobs, OpenRouter-backed AI analysis.

Ports the four prototype scripts in the parent dir (market_pulse,
flash_news, trading212, strategic_log) into async services backed by a
persistent DB and served via FastAPI + Jinja2 + HTMX. APScheduler runs
as a separate compose service for crash-safety and easier restarts.

Portfolio composition + position names come live from Trading 212;
news per-ticker headlines reuse those names. Tone (NOVICE/INTERMEDIATE/
PRO) and analysis style (DRY/SPECULATIVE) are env-configurable and
stored on each log row so historical entries show what produced them.

Default model is deepseek/deepseek-v4-flash (overridable via env).
Light/dark theme toggle, sans-serif for prose surfaces, monospace for
data. Bearer-token auth, OpenRouter monthly cost cap, RSS feeds auto-
disabled on consecutive failures.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/templates_env.py

@@ -0,0 +1,45 @@
+"""Shared Jinja2 environment with custom filters for the dashboard.
+Imported by both routers/pages.py and routers/api.py so the filters are
+registered exactly once."""
+from __future__ import annotations
+
+from pathlib import Path
+
+from fastapi.templating import Jinja2Templates
+
+
+TEMPLATE_DIR = Path(__file__).resolve().parent / "templates"
+
+
+def _fmt_price(v: float | None) -> str:
+    """Format a price in a way that's readable in dense terminal tables.
+    Avoids scientific notation for large round numbers (FTSE 25,962, not 2.596e+04)
+    and keeps enough precision for FX rates like 0.8725 EUR/GBP."""
+    if v is None:
+        return "—"
+    av = abs(v)
+    if av >= 1000:
+        return f"{v:,.2f}"
+    if av >= 10:
+        return f"{v:.2f}"
+    if av >= 1:
+        return f"{v:.4f}"
+    return f"{v:.4f}"
+
+
+def _fmt_signed(v: float | None, decimals: int = 2) -> str:
+    if v is None:
+        return "—"
+    return f"{v:+,.{decimals}f}"
+
+
+def _fmt_money(v: float | None) -> str:
+    if v is None:
+        return "—"
+    return f"{v:,.2f}"
+
+
+templates = Jinja2Templates(directory=str(TEMPLATE_DIR))
+templates.env.filters["price"] = _fmt_price
+templates.env.filters["signed"] = _fmt_signed
+templates.env.filters["money"] = _fmt_money