refactors

backend/schemas.py

@@ -277,3 +277,64 @@ class ConstantsResponse(BaseModel):
     roles: list[str]
     invite_statuses: list[InviteStatus]
     bitcoin_transfer_methods: list[BitcoinTransferMethod]
+
+
+# =============================================================================
+# Exchange Price/Config Schemas
+# =============================================================================
+
+
+class ExchangeConfigResponse(BaseModel):
+    """Exchange configuration for the frontend."""
+
+    eur_min: int
+    eur_max: int
+    eur_increment: int
+    premium_percentage: int
+
+
+class PriceResponse(BaseModel):
+    """Current BTC/EUR price for trading.
+
+    Note: The actual agreed price depends on trade direction (buy/sell)
+    and is calculated by the frontend using market_price and premium_percentage.
+    """
+
+    market_price: float  # Raw price from exchange
+    premium_percentage: int
+    timestamp: datetime
+    is_stale: bool
+
+
+class ExchangePriceResponse(BaseModel):
+    """Combined price and configuration response."""
+
+    price: PriceResponse | None  # None if price fetch failed
+    config: ExchangeConfigResponse
+    error: str | None = None
+
+
+class BookableSlot(BaseModel):
+    """A single bookable time slot."""
+
+    start_time: datetime
+    end_time: datetime
+
+
+class AvailableSlotsResponse(BaseModel):
+    """Response containing available slots for a date."""
+
+    date: date
+    slots: list[BookableSlot]
+
+
+# =============================================================================
+# Admin User Search Schemas
+# =============================================================================
+
+
+class UserSearchResult(BaseModel):
+    """Result item for user search."""
+
+    id: int
+    email: str