feat(routers): add executions, backups, and settings endpoints

backend/app/routers/executions.py

@@ -1,4 +1,23 @@
-from fastapi import APIRouter
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select
+from typing import List
+from app.database import get_db
+from app.models import JobExecution
+from app.schemas import JobExecution as JobExecutionSchema
 
 router = APIRouter(prefix="/api/executions", tags=["executions"])
-# Will be implemented in later tasks
+
+@router.get("/", response_model=List[JobExecutionSchema])
+async def list_executions(db: AsyncSession = Depends(get_db)):
+    result = await db.execute(select(JobExecution).order_by(JobExecution.started_at.desc()))
+    executions = result.scalars().all()
+    return executions
+
+@router.get("/{execution_id}", response_model=JobExecutionSchema)
+async def get_execution(execution_id: int, db: AsyncSession = Depends(get_db)):
+    result = await db.execute(select(JobExecution).where(JobExecution.id == execution_id))
+    execution = result.scalar_one_or_none()
+    if not execution:
+        raise HTTPException(status_code=404, detail="Execution not found")
+    return execution