decomposer: generate deliverable files for Define the service contract and project architecture for the FastAPI endpoint monitoring service.; Implement the typed monitor CRUD API and concurrency-safe in-memory state according to the service design.; Implement secure on-demand endpoint checks with status updates, latency measurement, robust error handling, and redacted structured logs.; Add operational API endpoints and environment-driven runtime configuration to the monitoring service.; Create automated tests for the monitoring service.; Package the service with Docker and developer documentation.; Validate the complete project.

app/models.py

@@ -2,69 +2,40 @@ from datetime import UTC, datetime
 from enum import StrEnum
 from uuid import UUID, uuid4
 
-from pydantic import BaseModel, ConfigDict, Field, HttpUrl, model_validator
+from pydantic import AnyHttpUrl, BaseModel, ConfigDict, Field
-
-
-def now_utc() -> datetime:
-    return datetime.now(UTC)
 
 
 class State(StrEnum):
-    NEVER_CHECKED = "never_checked"
+    UNKNOWN = "unknown"
     UP = "up"
     DOWN = "down"
     ERROR = "error"
-    BLOCKED = "blocked"
 
 
 class MonitorCreate(BaseModel):
     name: str = Field(min_length=1, max_length=100)
-    url: HttpUrl
+    url: AnyHttpUrl
-    expected_status: int = Field(default=200, ge=100, le=599)
 
 
 class MonitorUpdate(BaseModel):
     name: str | None = Field(default=None, min_length=1, max_length=100)
-    url: HttpUrl | None = None
+    url: AnyHttpUrl | None = None
-    expected_status: int | None = Field(default=None, ge=100, le=599)
-
-    @model_validator(mode="after")
-    def not_empty(self) -> "MonitorUpdate":
-        if not self.model_fields_set:
-            raise ValueError("at least one field is required")
-        return self
 
 
 class CurrentStatus(BaseModel):
-    model_config = ConfigDict(frozen=True)
+    state: State = State.UNKNOWN
-
-    state: State = State.NEVER_CHECKED
     checked_at: datetime | None = None
-    observed_status: int | None = None
+    status_code: int | None = None
-    latency_ms: float | None = None
+    latency_ms: float | None = Field(default=None, ge=0)
     error: str | None = None
 
 
 class Monitor(BaseModel):
-    model_config = ConfigDict(frozen=True)
+    model_config = ConfigDict(from_attributes=True)
 
     id: UUID = Field(default_factory=uuid4)
     name: str
-    url: HttpUrl
+    url: AnyHttpUrl
-    expected_status: int
+    created_at: datetime = Field(default_factory=lambda: datetime.now(UTC))
-    created_at: datetime = Field(default_factory=now_utc)
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(UTC))
-    updated_at: datetime = Field(default_factory=now_utc)
     current_status: CurrentStatus = Field(default_factory=CurrentStatus)
-
-
-class CheckResult(CurrentStatus):
-    monitor_id: UUID
-
-
-class ErrorBody(BaseModel):
-    code: str
-    message: str
-
-
-class ErrorResponse(BaseModel):
-    error: ErrorBody