feat: Add alert_mcp server

- Implemented `alert_mcp` package with FastAPI and FastMCP.
- Added database models for `Alert`.
- Implemented MCP tools: `log_alert`, `get_open_alerts`, `mark_alert_resolved`, `summarize_alerts`.
- Added REST endpoints for tools under `/mcp/tools/` and mounted MCP SSE app under `/sse`.
- Added unit tests.

.gitignore

@@ -0,0 +1,6 @@
+__pycache__/
+*.pyc
+*.db
+.pytest_cache/
+.venv/
+.env

pyproject.toml

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+[project]
+name = "alert_mcp"
+version = "0.1.0"
+description = "MCP server for CredentialWatch alerts"
+readme = "README.md"
+requires-python = ">=3.11"
+dependencies = [
+    "fastapi",
+    "uvicorn",
+    "sqlalchemy",
+    "pydantic",
+    "mcp",  # Assuming a generic mcp package or just standard http tools
+]
+
+[tool.uv]
+dev-dependencies = [
+    "pytest",
+    "httpx",
+]

src/alert_mcp/db.py

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+import os
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from .models import Base
+
+# Default to a local file for development/sandbox, but prompt suggests /data/credentialwatch.db
+DEFAULT_DB_PATH = os.getenv("DB_FILE_PATH", "credentialwatch.db")
+DATABASE_URL = f"sqlite:///{DEFAULT_DB_PATH}"
+
+engine = create_engine(
+    DATABASE_URL, connect_args={"check_same_thread": False}
+)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+def init_db():
+    Base.metadata.create_all(bind=engine)
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

src/alert_mcp/main.py

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+from fastapi import FastAPI, Depends, HTTPException, Request
+from sqlalchemy.orm import Session
+from typing import Optional, List, Any
+import uvicorn
+import mcp.types as types
+from mcp.server.fastmcp import FastMCP
+
+from .db import get_db, init_db
+from .schemas import AlertCreate, AlertRead, AlertSummary
+from . import mcp_tools
+
+# Initialize DB
+init_db()
+
+# Create MCP Server
+mcp = FastMCP("alert_mcp")
+
+# --- MCP Tool Definitions ---
+
+@mcp.tool()
+def log_alert(
+    provider_id: int,
+    severity: str,
+    window_days: int,
+    message: str,
+    credential_id: Optional[int] = None,
+    channel: str = "ui"
+) -> str:
+    """
+    Log a new alert for CredentialWatch.
+    Severity must be 'info', 'warning', or 'critical'.
+    """
+    # Note: For MCP tools we manage the session manually within the tool
+    # as they are not standard FastAPI routes dependent on the app dependency injection
+    db = next(get_db())
+    try:
+        alert = mcp_tools.log_alert(
+            db=db,
+            provider_id=provider_id,
+            credential_id=credential_id,
+            severity=severity,
+            window_days=window_days,
+            message=message,
+            channel=channel
+        )
+        return alert.json()
+    except ValueError as e:
+        return f"Error: {str(e)}"
+    finally:
+        db.close()
+
+@mcp.tool()
+def get_open_alerts(
+    provider_id: Optional[int] = None,
+    severity: Optional[str] = None
+) -> str:
+    """
+    List open (unresolved) alerts.
+    Optional filters: provider_id, severity.
+    Returns JSON list of alerts.
+    """
+    db = next(get_db())
+    try:
+        alerts = mcp_tools.get_open_alerts(db=db, provider_id=provider_id, severity=severity)
+        return "[" + ",".join([a.json() for a in alerts]) + "]"
+    finally:
+        db.close()
+
+@mcp.tool()
+def mark_alert_resolved(
+    alert_id: int,
+    resolution_note: Optional[str] = None
+) -> str:
+    """
+    Mark an alert as resolved.
+    Returns the updated alert as JSON.
+    """
+    db = next(get_db())
+    try:
+        alert = mcp_tools.mark_alert_resolved(db=db, alert_id=alert_id, resolution_note=resolution_note)
+        return alert.json()
+    except ValueError as e:
+        return f"Error: {str(e)}"
+    finally:
+        db.close()
+
+@mcp.tool()
+def summarize_alerts(window_days: Optional[int] = None) -> str:
+    """
+    Get a summary of alerts (count by severity).
+    Optionally filter by last N days.
+    """
+    db = next(get_db())
+    try:
+        summary = mcp_tools.summarize_alerts(db=db, window_days=window_days)
+        return summary.json()
+    finally:
+        db.close()
+
+# --- FastAPI App ---
+
+app = FastAPI(title="Alert MCP Server")
+
+# Mount MCP Server (SSE)
+# FastMCP provides .sse_app() which returns a Starlette app that can be mounted
+app.mount("/sse", mcp.sse_app())
+
+@app.get("/health")
+def health():
+    return {"status": "ok"}
+
+# REST Endpoints for Gradio / UI
+@app.post("/api/log_alert", response_model=AlertRead)
+def api_log_alert(
+    alert: AlertCreate,
+    db: Session = Depends(get_db)
+):
+    try:
+        return mcp_tools.log_alert(
+            db=db,
+            provider_id=alert.provider_id,
+            credential_id=alert.credential_id,
+            severity=alert.severity,
+            window_days=alert.window_days,
+            message=alert.message,
+            channel=alert.channel
+        )
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+@app.get("/api/alerts", response_model=List[AlertRead])
+def api_get_alerts(
+    provider_id: Optional[int] = None,
+    severity: Optional[str] = None,
+    db: Session = Depends(get_db)
+):
+    return mcp_tools.get_open_alerts(db=db, provider_id=provider_id, severity=severity)
+
+@app.post("/api/alerts/{alert_id}/resolve", response_model=AlertRead)
+def api_resolve_alert(
+    alert_id: int,
+    resolution_note: Optional[str] = None,
+    db: Session = Depends(get_db)
+):
+    try:
+        return mcp_tools.mark_alert_resolved(db=db, alert_id=alert_id, resolution_note=resolution_note)
+    except ValueError as e:
+        raise HTTPException(status_code=404, detail=str(e))
+
+@app.get("/api/summary", response_model=AlertSummary)
+def api_summary(
+    window_days: Optional[int] = None,
+    db: Session = Depends(get_db)
+):
+    return mcp_tools.summarize_alerts(db=db, window_days=window_days)
+
+
+# Now integrating with FasteMCP for the actual MCP protocol support
+# I will use `mcp` library if it exists.
+# Since I am writing the code without checking `mcp` lib, I will assume `FasteMCP` works as a standalone app
+# or I can mount it.
+
+# If `mcp` is not installed in the environment, this file will fail.
+# But I put `mcp` in pyproject.toml.
+
+# Let's make `app` the main entry point and mount the MCP server if possible.
+# Or if FasteMCP is an app, we can use it.
+
+# Given the specific path requirement "/mcp/tools/{tool_name}", I'm suspicious this might be a custom requirement.
+# But standard MCP over SSE uses /sse and /messages (or similar).
+
+# "MCP tool endpoints under /mcp/tools/{tool_name}"
+# This looks like:
+# POST /mcp/tools/log_alert
+# POST /mcp/tools/get_open_alerts
+# ...
+# This is explicitly what was requested. So I will add these specific routes.
+
+@app.post("/mcp/tools/log_alert")
+async def mcp_log_alert(payload: AlertCreate, db: Session = Depends(get_db)):
+    # Helper to wrap the logic
+    try:
+        return mcp_tools.log_alert(
+            db=db,
+            provider_id=payload.provider_id,
+            credential_id=payload.credential_id,
+            severity=payload.severity,
+            window_days=payload.window_days,
+            message=payload.message,
+            channel=payload.channel
+        )
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+@app.post("/mcp/tools/get_open_alerts")
+async def mcp_get_open_alerts(
+    provider_id: Optional[int] = None,
+    severity: Optional[str] = None,
+    db: Session = Depends(get_db)
+):
+    return mcp_tools.get_open_alerts(db=db, provider_id=provider_id, severity=severity)
+
+@app.post("/mcp/tools/mark_alert_resolved")
+async def mcp_mark_alert_resolved(
+    alert_id: int,
+    resolution_note: Optional[str] = None,
+    db: Session = Depends(get_db)
+):
+    try:
+        return mcp_tools.mark_alert_resolved(db=db, alert_id=alert_id, resolution_note=resolution_note)
+    except ValueError as e:
+        raise HTTPException(status_code=404, detail=str(e))
+
+@app.post("/mcp/tools/summarize_alerts")
+async def mcp_summarize_alerts(window_days: Optional[int] = None, db: Session = Depends(get_db)):
+    return mcp_tools.summarize_alerts(db=db, window_days=window_days)
+
+# Finally, I'll attempt to mount the FasteMCP app if I can, to support "real" MCP over SSE.
+# But without documentation on FasteMCP in this context, I might skip it and rely on the REST endpoints
+# satisfying the "MCP tool endpoints" requirement, as that is what was explicitly asked.
+# The prompt says "MCP: HTTP + SSE". This strongly suggests standard MCP support.
+
+# I will try to include the standard MCP setup using the `mcp` library from Anthropic or similar.
+# Assuming `mcp` package is available (it is in my toml).
+
+try:
+    # This is a best-effort integration with the `mcp` python sdk
+    from mcp.server.fastapi import Server
+    import mcp.types as types
+
+    # I'll need to define the server
+    # But FasteMCP mentioned above is from `mcp`? I might have hallucinated `FasteMCP` name
+    # if it's not in the standard lib. The standard lib usually has `Server`.
+    # I'll stick to the requested structure and minimal implementation.
+    pass
+except ImportError:
+    pass
+
+if __name__ == "__main__":
+    uvicorn.run(app, host="0.0.0.0", port=8000)

src/alert_mcp/mcp_tools.py

@@ -0,0 +1,129 @@
+from datetime import datetime, timedelta
+from typing import Optional, List, Dict, Any
+from sqlalchemy.orm import Session
+from sqlalchemy import desc, func
+
+from .models import Alert
+from .schemas import AlertCreate, AlertRead, AlertSummary
+
+def log_alert(
+    db: Session,
+    provider_id: int,
+    severity: str,
+    window_days: int,
+    message: str,
+    credential_id: Optional[int] = None,
+    channel: str = "ui"
+) -> AlertRead:
+    """
+    Inserts a new row into alerts.
+    Validates severity (only allow "info", "warning", "critical").
+    Returns the created alert record.
+    """
+    if severity not in ("info", "warning", "critical"):
+        raise ValueError("Severity must be one of: 'info', 'warning', 'critical'")
+
+    alert_data = AlertCreate(
+        provider_id=provider_id,
+        credential_id=credential_id,
+        severity=severity,
+        window_days=window_days,
+        message=message,
+        channel=channel
+    )
+
+    db_alert = Alert(**alert_data.dict())
+    db.add(db_alert)
+    db.commit()
+    db.refresh(db_alert)
+    return AlertRead.from_orm(db_alert)
+
+def get_open_alerts(
+    db: Session,
+    provider_id: Optional[int] = None,
+    severity: Optional[str] = None
+) -> List[AlertRead]:
+    """
+    Returns alerts where resolved_at IS NULL.
+    Optional filters: by provider_id, by severity.
+    Sorted by severity (critical > warning > info), then by created_at desc.
+    """
+    query = db.query(Alert).filter(Alert.resolved_at == None)
+
+    if provider_id is not None:
+        query = query.filter(Alert.provider_id == provider_id)
+
+    if severity is not None:
+        query = query.filter(Alert.severity == severity)
+
+    # Sorting: critical (3), warning (2), info (1)
+    # We can use a CASE statement for custom sort order or mapped values.
+    # A simple way in python is to fetch and sort, but doing it in SQL is better.
+    # Let's map severity to int for sorting using SQLAlchemy case
+    from sqlalchemy import case
+
+    severity_order = case(
+        (Alert.severity == 'critical', 3),
+        (Alert.severity == 'warning', 2),
+        (Alert.severity == 'info', 1),
+        else_=0
+    )
+
+    query = query.order_by(severity_order.desc(), Alert.created_at.desc())
+
+    alerts = query.all()
+    return [AlertRead.from_orm(a) for a in alerts]
+
+def mark_alert_resolved(
+    db: Session,
+    alert_id: int,
+    resolution_note: Optional[str] = None
+) -> AlertRead:
+    """
+    Updates resolved_at with current timestamp.
+    Sets resolution_note.
+    Returns the updated alert.
+    """
+    alert = db.query(Alert).filter(Alert.id == alert_id).first()
+    if not alert:
+        raise ValueError(f"Alert with id {alert_id} not found")
+
+    alert.resolved_at = datetime.utcnow()
+    alert.resolution_note = resolution_note
+    db.commit()
+    db.refresh(alert)
+    return AlertRead.from_orm(alert)
+
+def summarize_alerts(
+    db: Session,
+    window_days: Optional[int] = None
+) -> AlertSummary:
+    """
+    For a dashboard:
+      - Count alerts by severity.
+      - Optionally filter by alerts created in the last window_days.
+    """
+    query = db.query(Alert.severity, func.count(Alert.id))
+
+    if window_days is not None:
+        cutoff = datetime.utcnow() - timedelta(days=window_days)
+        query = query.filter(Alert.created_at >= cutoff)
+
+    query = query.group_by(Alert.severity)
+    results = query.all()
+
+    # results is list of (severity, count)
+    counts = {row[0]: row[1] for row in results}
+
+    # Fill missing keys with 0
+    for s in ["info", "warning", "critical"]:
+        if s not in counts:
+            counts[s] = 0
+
+    total = sum(counts.values())
+
+    return AlertSummary(
+        window_days=window_days,
+        total_alerts=total,
+        by_severity=counts
+    )

src/alert_mcp/models.py

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+from datetime import datetime
+from typing import Optional
+from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
+
+class Base(DeclarativeBase):
+    pass
+
+class Alert(Base):
+    __tablename__ = "alerts"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
+    # Using Integer directly as we might not have the providers/credentials tables in this context
+    # In a full system with shared models, these would be ForeignKey("providers.id")
+    provider_id: Mapped[int] = mapped_column(Integer, nullable=False)
+    credential_id: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
+
+    severity: Mapped[str] = mapped_column(String, nullable=False) # "info", "warning", "critical"
+    window_days: Mapped[int] = mapped_column(Integer, nullable=False)
+    message: Mapped[str] = mapped_column(Text, nullable=False)
+    channel: Mapped[str] = mapped_column(String, default="ui")
+
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+    resolved_at: Mapped[Optional[datetime]] = mapped_column(DateTime, nullable=True)
+    resolution_note: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
+
+    def __repr__(self):
+        return f"<Alert(id={self.id}, severity='{self.severity}', message='{self.message}')>"

src/alert_mcp/schemas.py

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+from datetime import datetime
+from typing import Optional, Literal
+from pydantic import BaseModel, Field, validator
+
+class AlertBase(BaseModel):
+    provider_id: int
+    credential_id: Optional[int] = None
+    severity: Literal["info", "warning", "critical"]
+    window_days: int
+    message: str
+    channel: str = "ui"
+
+class AlertCreate(AlertBase):
+    pass
+
+class AlertRead(AlertBase):
+    id: int
+    created_at: datetime
+    resolved_at: Optional[datetime] = None
+    resolution_note: Optional[str] = None
+
+    class Config:
+        from_attributes = True
+
+class AlertSummary(BaseModel):
+    window_days: Optional[int]
+    total_alerts: int
+    by_severity: dict[str, int]

tests/test_alert_mcp.py

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+import pytest
+from fastapi.testclient import TestClient
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from src.alert_mcp.main import app, get_db
+from src.alert_mcp.models import Base, Alert
+from src.alert_mcp.schemas import AlertCreate
+
+# Setup in-memory DB for tests
+# We need to make sure the connection is shared if we use :memory:
+# or use a file. The issue with :memory: and multiple sessions is that
+# each connection gets a fresh DB unless shared cache is used or same connection.
+# For FastAPI dependency injection with SessionLocal, each request gets a new session.
+# If they open new connections, they might see different in-memory DBs if not careful.
+# But SQLAlchemy engine usually pools connections.
+
+# Let's try StaticPool for in-memory testing to keep data across sessions
+from sqlalchemy.pool import StaticPool
+
+SQLALCHEMY_DATABASE_URL = "sqlite:///:memory:"
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False},
+    poolclass=StaticPool
+)
+TestingSessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+def override_get_db():
+    try:
+        db = TestingSessionLocal()
+        yield db
+    finally:
+        db.close()
+
+app.dependency_overrides[get_db] = override_get_db
+
+@pytest.fixture(autouse=True)
+def init_test_db():
+    Base.metadata.create_all(bind=engine)
+    yield
+    Base.metadata.drop_all(bind=engine)
+
+@pytest.fixture
+def client():
+    return TestClient(app)
+
+def test_log_alert(client):
+    response = client.post(
+        "/mcp/tools/log_alert",
+        json={
+            "provider_id": 1,
+            "severity": "critical",
+            "window_days": 30,
+            "message": "Test alert",
+            "channel": "ui"
+        }
+    )
+    assert response.status_code == 200
+    data = response.json()
+    assert data["provider_id"] == 1
+    assert data["severity"] == "critical"
+    assert data["id"] is not None
+    assert data["resolved_at"] is None
+
+def test_log_alert_invalid_severity(client):
+    response = client.post(
+        "/mcp/tools/log_alert",
+        json={
+            "provider_id": 1,
+            "severity": "super_critical",
+            "window_days": 30,
+            "message": "Test alert"
+        }
+    )
+    # FastAPI/Pydantic validation returns 422 Unprocessable Entity
+    assert response.status_code == 422
+
+def test_get_open_alerts(client):
+    # Create two alerts
+    client.post("/mcp/tools/log_alert", json={
+        "provider_id": 1, "severity": "info", "window_days": 30, "message": "Info alert"
+    })
+    client.post("/mcp/tools/log_alert", json={
+        "provider_id": 1, "severity": "critical", "window_days": 30, "message": "Critical alert"
+    })
+
+    # Get all open alerts
+    response = client.post("/mcp/tools/get_open_alerts", json={})
+    assert response.status_code == 200
+    data = response.json()
+    assert len(data) == 2
+    # Check sorting: critical should be first
+    assert data[0]["severity"] == "critical"
+    assert data[1]["severity"] == "info"
+
+def test_mark_alert_resolved(client):
+    # Create alert
+    create_res = client.post("/mcp/tools/log_alert", json={
+        "provider_id": 1, "severity": "warning", "window_days": 30, "message": "Warning alert"
+    })
+    alert_id = create_res.json()["id"]
+
+    # Resolve it
+    response = client.post(
+        "/mcp/tools/mark_alert_resolved",
+        params={"alert_id": alert_id, "resolution_note": "Fixed it"}
+    )
+    assert response.status_code == 200
+    data = response.json()
+    assert data["resolved_at"] is not None
+    assert data["resolution_note"] == "Fixed it"
+
+    # Verify it's not in open alerts
+    open_res = client.post("/mcp/tools/get_open_alerts", json={})
+    assert len(open_res.json()) == 0
+
+def test_summarize_alerts(client):
+    client.post("/mcp/tools/log_alert", json={"provider_id": 1, "severity": "info", "window_days": 30, "message": "1"})
+    client.post("/mcp/tools/log_alert", json={"provider_id": 1, "severity": "info", "window_days": 30, "message": "2"})
+    client.post("/mcp/tools/log_alert", json={"provider_id": 1, "severity": "critical", "window_days": 30, "message": "3"})
+
+    response = client.post("/mcp/tools/summarize_alerts", json={})
+    assert response.status_code == 200
+    data = response.json()
+    assert data["total_alerts"] == 3
+    assert data["by_severity"]["info"] == 2
+    assert data["by_severity"]["critical"] == 1
+    assert data["by_severity"]["warning"] == 0