phase G: data minimisation + passwordless auth + DeepSeek-first LLM

Server no longer holds portfolios. Holdings live in the browser
(localStorage); the server publishes an anonymous ticker_universe and a
gzipped /api/universe payload identical for every authenticated user, so
access patterns can't betray which tickers a user holds. AI commentary
is generated ephemerally from the browser-supplied pie and the cost
ledger row records no positions. Migrations 0009-0011 added the
universe table and dropped positions / portfolio_snapshots /
portfolios.

Authentication is now e-mail OTP only. Migration 0010 dropped
password_hash and email_verified (every active session is by
construction proof of email control). The /signup endpoint is gone;
signup and login share a single email-entry page. Email rendering is
HTML+plain-text multipart with a shared brand palette (app/branding.py)
asserted in sync with the CSS by a drift-detection test.

LLM provider defaults to DeepSeek-direct (cheaper, api.deepseek.com)
with OpenRouter as automatic fallback if DeepSeek fails. ai_log_job and
indicator_summary_job now iterate the two tones (NOVICE, INTERMEDIATE)
per cycle so the dashboard's tone toggle is instant; PROMPT_VERSION
bumped to 6 with an educational anti-TA / anti-gambling stance baked
into _CORE. NOVICE mode renders a curated glossary inline (CBOE VIX,
yield curve, HY OAS, etc.) with JS-positioned tooltips that survive
viewport edges and sticky bars. Model name and tokens hidden from the
user UI; still recorded in StrategicLog.model and AICall for admin.

Layout adds a sticky top nav, a sticky bottom markets bar (one chip per
exchange with status LED + headline index + 1d change), and
Phase H feedback reporting is queued in tasks/todo.md.

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

alembic/versions/0009_ticker_universe.py

@@ -0,0 +1,43 @@
+"""ticker_universe — server-wide set of tracked tickers, no user attribution
+
+Phase G of the multi-user migration. Adds the additive table only; old
+portfolio tables (positions / portfolio_snapshots / portfolios) are dropped
+in migration 0010 after the new path is verified end-to-end.
+
+Revision ID: 0009
+Revises: 0008
+Create Date: 2026-05-16
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+
+revision: str = "0009"
+down_revision: Union[str, None] = "0008"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "ticker_universe",
+        # Yahoo Finance ticker is the canonical key. T212 shortnames are
+        # resolved to Yahoo tickers at parse time via instrument_map.
+        sa.Column("yahoo_ticker", sa.String(32), primary_key=True),
+        sa.Column("currency", sa.String(8)),
+        sa.Column("first_seen_at", sa.DateTime(timezone=True), nullable=False),
+        # Refreshed whenever the ticker appears in a /api/portfolio/parse
+        # or /api/analyze request. Eviction cron prunes rows older than
+        # the configured TTL.
+        sa.Column("last_referenced_at", sa.DateTime(timezone=True), nullable=False),
+    )
+    op.create_index(
+        "ix_universe_last_ref", "ticker_universe", ["last_referenced_at"]
+    )
+
+
+def downgrade() -> None:
+    op.drop_index("ix_universe_last_ref", table_name="ticker_universe")
+    op.drop_table("ticker_universe")