done

app/models.py

@@ -18,9 +18,21 @@ from app.database import Base
 
 
 def utcnow() -> datetime:
+    """Naive UTC datetime. All datetimes in this codebase are stored as naive-UTC."""
     return datetime.now(timezone.utc).replace(tzinfo=None)
 
 
+def iso_utc(dt: Optional[datetime]) -> Optional[str]:
+    """Serialize a naive-UTC datetime to an explicit ISO-8601 UTC string (suffix 'Z').
+    If dt already carries tzinfo, convert to UTC first. Returns None if dt is None."""
+    if dt is None:
+        return None
+    if dt.tzinfo is not None:
+        dt = dt.astimezone(timezone.utc).replace(tzinfo=None)
+    # Drop microseconds past millisecond for compactness; always end in Z
+    return dt.isoformat(timespec="milliseconds") + "Z"
+
+
 class Post(Base):
     __tablename__ = "posts"
 
@@ -39,6 +51,8 @@ class Post(Base):
     price_at_post: Mapped[Optional[float]] = mapped_column(Float, nullable=True)
     signal: Mapped[Optional[str]] = mapped_column(String(8), nullable=True)
     ai_reasoning: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
+    prefilter_reason: Mapped[Optional[str]] = mapped_column(String(32), nullable=True)
+    analysis_version: Mapped[Optional[str]] = mapped_column(String(16), nullable=True)
     created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=utcnow)
 
     trades: Mapped[List["BotTrade"]] = relationship("BotTrade", back_populates="trigger_post")
@@ -89,3 +103,10 @@ class Subscription(Base):
     active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
     subscribed_at: Mapped[Optional[datetime]] = mapped_column(DateTime, nullable=True)
     created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=utcnow)
+
+    # Per-user trading config (null → use platform defaults)
+    leverage: Mapped[int] = mapped_column(Integer, nullable=False, default=3)
+    position_size_usd: Mapped[float] = mapped_column(Float, nullable=False, default=20.0)
+    take_profit_pct: Mapped[Optional[float]] = mapped_column(Float, nullable=True)   # e.g. 2.0 = close at +2%
+    stop_loss_pct: Mapped[Optional[float]] = mapped_column(Float, nullable=True)     # e.g. 1.5 = close at -1.5%
+    min_confidence: Mapped[int] = mapped_column(Integer, nullable=False, default=80)