i18n: localize indicator summaries (per-group + aggregate read)

app/models.py

@@ -172,6 +172,37 @@ class IndicatorSummary(Base):
     __table_args__ = (Index("ix_indsumm_group_generated", "group_name", "generated_at"),)
 
 
+class IndicatorSummaryTranslation(Base):
+    """Cached translation of a single IndicatorSummary row.
+
+    Same pattern as StrategicLogTranslation: one row per
+    (summary_id, lang). Populated by indicator_summary_job after the
+    English row is committed. The dashboard / indicators endpoints
+    swap in the matching translation when a user with a non-en
+    lang preference loads them, falling back silently to the English
+    source when no row exists yet.
+    """
+    __tablename__ = "indicator_summary_translations"
+
+    id: Mapped[int] = mapped_column(_PK, primary_key=True, autoincrement=True)
+    summary_id: Mapped[int] = mapped_column(
+        BigInteger().with_variant(Integer(), "sqlite"),
+        ForeignKey("indicator_summaries.id", ondelete="CASCADE"),
+        nullable=False,
+    )
+    lang: Mapped[str] = mapped_column(String(8), nullable=False)
+    content_md: Mapped[str] = mapped_column(Text, nullable=False)
+    generated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, default=utcnow,
+    )
+    llm_model: Mapped[str | None] = mapped_column(String(64))
+    llm_cost_usd: Mapped[float | None] = mapped_column(Float)
+
+    __table_args__ = (
+        UniqueConstraint("summary_id", "lang", name="uq_ist_summary_lang"),
+    )
+
+
 class AICall(Base):
     """Cost ledger for OpenRouter calls. Feeds the monthly cap check."""
     __tablename__ = "ai_calls"