first commit

app/chats/schemas.py

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+from datetime import datetime
+
+from pydantic import BaseModel, ConfigDict, Field
+
+from app.chats.models import ChatMemberRole, ChatType
+
+
+class ChatRead(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int
+    type: ChatType
+    title: str | None = None
+    created_at: datetime
+
+
+class ChatMemberRead(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int
+    user_id: int
+    role: ChatMemberRole
+    joined_at: datetime
+
+
+class ChatDetailRead(ChatRead):
+    members: list[ChatMemberRead]
+
+
+class ChatCreateRequest(BaseModel):
+    type: ChatType
+    title: str | None = Field(default=None, max_length=255)
+    member_ids: list[int] = Field(default_factory=list)