first commit

app/schemas/ticker.py

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+"""Ticker request/response schemas."""
+
+from datetime import datetime
+
+from pydantic import BaseModel, Field
+
+
+class TickerCreate(BaseModel):
+    symbol: str = Field(..., description="NASDAQ ticker symbol (e.g. AAPL)")
+
+
+class TickerResponse(BaseModel):
+    id: int
+    symbol: str
+    created_at: datetime
+
+    model_config = {"from_attributes": True}