first commit

backend/app/api/analysis.py

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+"""Analysis API: get flow graph and summary for a case."""
+
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models.database import get_db
+from app.models import Case, Transaction
+from app.schemas import TransactionResponse, AnalysisSummaryResponse, FlowGraphResponse
+from app.services.analyzer import build_flow_graph
+
+router = APIRouter()
+
+
+@router.get("/{case_id}/transactions", response_model=list[TransactionResponse])
+async def list_transactions(case_id: int, db: AsyncSession = Depends(get_db)):
+    r = await db.execute(select(Case).where(Case.id == case_id))
+    if not r.scalar_one_or_none():
+        raise HTTPException(status_code=404, detail="Case not found")
+    r = await db.execute(
+        select(Transaction).where(Transaction.case_id == case_id).order_by(Transaction.transaction_time, Transaction.id)
+    )
+    txns = r.scalars().all()
+    return [TransactionResponse.model_validate(t) for t in txns]
+
+
+@router.get("/{case_id}/analysis")
+async def get_analysis(case_id: int, db: AsyncSession = Depends(get_db)):
+    r = await db.execute(select(Case).where(Case.id == case_id))
+    if not r.scalar_one_or_none():
+        raise HTTPException(status_code=404, detail="Case not found")
+    r = await db.execute(select(Transaction).where(Transaction.case_id == case_id))
+    txns = r.scalars().all()
+    items = [TransactionResponse.model_validate(t) for t in txns]
+    graph, summary = build_flow_graph(items)
+    return {"summary": summary.model_dump(), "graph": graph.model_dump()}
+
+
+@router.post("/{case_id}/analysis")
+async def run_analysis(case_id: int, db: AsyncSession = Depends(get_db)):
+    return await get_analysis(case_id, db)