feat: rewrite lib/server/projects.ts to use Postgres instead of Firestore

lib/server/projects.ts

@@ -1,5 +1,4 @@
-import { FieldValue } from 'firebase-admin/firestore';
-import { getAdminDb } from '@/lib/firebase/admin';
+import { query } from '@/lib/db-postgres';
 import type {
   ProjectPhase,
   ProjectPhaseData,
@@ -21,14 +20,17 @@ export function toStage(stage?: string | null): ProjectStage {
 }
 
 export async function loadPhaseContainers(projectId: string) {
-  const adminDb = getAdminDb();
-  const projectRef = adminDb.collection('projects').doc(projectId);
-  const snapshot = await projectRef.get();
-  const doc = snapshot.data() || {};
+  const rows = await query<{ id: string; data: any }>(`
+    SELECT id, data FROM fs_projects WHERE id = $1 LIMIT 1
+  `, [projectId]);
+
+  if (rows.length === 0) throw new Error(`Project ${projectId} not found`);
+
+  const doc = rows[0].data || {};
   const phaseData = (doc.phaseData ?? {}) as ProjectPhaseData;
   const phaseScores = (doc.phaseScores ?? {}) as ProjectPhaseScores;
   const phaseHistory = Array.isArray(doc.phaseHistory) ? [...doc.phaseHistory] : [];
-  return { projectRef, phaseData, phaseScores, phaseHistory };
+  return { projectId, doc, phaseData, phaseScores, phaseHistory };
 }
 
 interface PersistencePayload {
@@ -46,19 +48,19 @@ export async function persistPhaseArtifacts(
     phaseHistory: Array<Record<string, unknown>>,
   ) => PersistencePayload,
 ) {
-  const { projectRef, phaseData, phaseScores, phaseHistory } = await loadPhaseContainers(projectId);
+  const { doc, phaseData, phaseScores, phaseHistory } = await loadPhaseContainers(projectId);
   const payload = builder(phaseData, phaseScores, phaseHistory);
 
-  await projectRef.set(
-    {
+  const updated = {
+    ...doc,
     phaseData: payload.phaseData,
     phaseScores: payload.phaseScores,
     phaseHistory: payload.phaseHistory,
-      ...(payload.nextPhase ? { currentPhase: payload.nextPhase, phaseStatus: 'completed' as const } : {}),
-      updatedAt: FieldValue.serverTimestamp(),
-    },
-    { merge: true },
-  );
+    updatedAt: new Date().toISOString(),
+    ...(payload.nextPhase ? { currentPhase: payload.nextPhase, phaseStatus: 'completed' } : {}),
+  };
+
+  await query(`
+    UPDATE fs_projects SET data = $1::jsonb WHERE id = $2
+  `, [JSON.stringify(updated), projectId]);
 }
-
-