perf(server): add targeted projection queries

apps/server/src/checkpointing/Layers/CheckpointDiffQuery.test.ts

@@ -1,83 +1,38 @@
-import {
-  CheckpointRef,
-  DEFAULT_PROVIDER_INTERACTION_MODE,
-  ProjectId,
-  ThreadId,
-  TurnId,
-  type OrchestrationReadModel,
-} from "@t3tools/contracts";
-import { Effect, Layer } from "effect";
+import { CheckpointRef, ProjectId, ThreadId, TurnId } from "@t3tools/contracts";
+import { Effect, Layer, Option } from "effect";
 import { describe, expect, it } from "vitest";
 
-import { ProjectionSnapshotQuery } from "../../orchestration/Services/ProjectionSnapshotQuery.ts";
+import {
+  ProjectionSnapshotQuery,
+  type ProjectionThreadCheckpointContext,
+} from "../../orchestration/Services/ProjectionSnapshotQuery.ts";
 import { checkpointRefForThreadTurn } from "../Utils.ts";
 import { CheckpointDiffQueryLive } from "./CheckpointDiffQuery.ts";
 import { CheckpointStore, type CheckpointStoreShape } from "../Services/CheckpointStore.ts";
 import { CheckpointDiffQuery } from "../Services/CheckpointDiffQuery.ts";
 
-function makeSnapshot(input: {
+function makeThreadCheckpointContext(input: {
   readonly projectId: ProjectId;
   readonly threadId: ThreadId;
   readonly workspaceRoot: string;
   readonly worktreePath: string | null;
   readonly checkpointTurnCount: number;
   readonly checkpointRef: CheckpointRef;
-}): OrchestrationReadModel {
+}): ProjectionThreadCheckpointContext {
   return {
-    snapshotSequence: 0,
-    updatedAt: "2026-01-01T00:00:00.000Z",
-    projects: [
-      {
-        id: input.projectId,
-        title: "Project",
-        workspaceRoot: input.workspaceRoot,
-        defaultModelSelection: null,
-        scripts: [],
-        createdAt: "2026-01-01T00:00:00.000Z",
-        updatedAt: "2026-01-01T00:00:00.000Z",
-        deletedAt: null,
-      },
-    ],
-    threads: [
+    threadId: input.threadId,
+    projectId: input.projectId,
+    workspaceRoot: input.workspaceRoot,
+    worktreePath: input.worktreePath,
+    checkpoints: [
       {
-        id: input.threadId,
-        projectId: input.projectId,
-        title: "Thread",
-        modelSelection: {
-          provider: "codex",
-          model: "gpt-5-codex",
-        },
-        interactionMode: DEFAULT_PROVIDER_INTERACTION_MODE,
-        runtimeMode: "full-access",
-        branch: null,
-        worktreePath: input.worktreePath,
-        latestTurn: {
-          turnId: TurnId.makeUnsafe("turn-1"),
-          state: "completed",
-          requestedAt: "2026-01-01T00:00:00.000Z",
-          startedAt: "2026-01-01T00:00:00.000Z",
-          completedAt: "2026-01-01T00:00:00.000Z",
-          assistantMessageId: null,
-        },
-        createdAt: "2026-01-01T00:00:00.000Z",
-        updatedAt: "2026-01-01T00:00:00.000Z",
-        archivedAt: null,
-        deletedAt: null,
-        messages: [],
-        activities: [],
-        proposedPlans: [],
-        checkpoints: [
-          {
-            turnId: TurnId.makeUnsafe("turn-1"),
-            checkpointTurnCount: input.checkpointTurnCount,
-            checkpointRef: input.checkpointRef,
-            status: "ready",
-            files: [],
-            assistantMessageId: null,
-            completedAt: "2026-01-01T00:00:00.000Z",
-          },
-        ],
-        session: null,
+        turnId: TurnId.makeUnsafe("turn-1"),
+        checkpointTurnCount: input.checkpointTurnCount,
+        checkpointRef: input.checkpointRef,
+        status: "ready",
+        files: [],
+        assistantMessageId: null,
+        completedAt: "2026-01-01T00:00:00.000Z",
       },
     ],
   };
@@ -95,7 +50,7 @@ describe("CheckpointDiffQueryLive", () => {
       readonly cwd: string;
     }> = [];
 
-    const snapshot = makeSnapshot({
+    const threadCheckpointContext = makeThreadCheckpointContext({
       projectId,
       threadId,
       workspaceRoot: "/tmp/workspace",
@@ -125,7 +80,12 @@ describe("CheckpointDiffQueryLive", () => {
       Layer.provideMerge(Layer.succeed(CheckpointStore, checkpointStore)),
       Layer.provideMerge(
         Layer.succeed(ProjectionSnapshotQuery, {
-          getSnapshot: () => Effect.succeed(snapshot),
+          getSnapshot: () =>
+            Effect.die("CheckpointDiffQuery should not request the full orchestration snapshot"),
+          getCounts: () => Effect.succeed({ projectCount: 0, threadCount: 0 }),
+          getActiveProjectByWorkspaceRoot: () => Effect.succeed(Option.none()),
+          getFirstActiveThreadIdByProjectId: () => Effect.succeed(Option.none()),
+          getThreadCheckpointContext: () => Effect.succeed(Option.some(threadCheckpointContext)),
         }),
       ),
     );
@@ -175,12 +135,11 @@ describe("CheckpointDiffQueryLive", () => {
       Layer.provideMerge(
         Layer.succeed(ProjectionSnapshotQuery, {
           getSnapshot: () =>
-            Effect.succeed({
-              snapshotSequence: 0,
-              projects: [],
-              threads: [],
-              updatedAt: "2026-01-01T00:00:00.000Z",
-            } satisfies OrchestrationReadModel),
+            Effect.die("CheckpointDiffQuery should not request the full orchestration snapshot"),
+          getCounts: () => Effect.succeed({ projectCount: 0, threadCount: 0 }),
+          getActiveProjectByWorkspaceRoot: () => Effect.succeed(Option.none()),
+          getFirstActiveThreadIdByProjectId: () => Effect.succeed(Option.none()),
+          getThreadCheckpointContext: () => Effect.succeed(Option.none()),
         }),
       ),
     );

apps/server/src/checkpointing/Layers/CheckpointDiffQuery.ts

@@ -4,11 +4,11 @@ import {
   type OrchestrationGetFullThreadDiffResult,
   type OrchestrationGetTurnDiffResult as OrchestrationGetTurnDiffResultType,
 } from "@t3tools/contracts";
-import { Effect, Layer, Schema } from "effect";
+import { Effect, Layer, Option, Schema } from "effect";
 
 import { ProjectionSnapshotQuery } from "../../orchestration/Services/ProjectionSnapshotQuery.ts";
 import { CheckpointInvariantError, CheckpointUnavailableError } from "../Errors.ts";
-import { checkpointRefForThreadTurn, resolveThreadWorkspaceCwd } from "../Utils.ts";
+import { checkpointRefForThreadTurn } from "../Utils.ts";
 import { CheckpointStore } from "../Services/CheckpointStore.ts";
 import {
   CheckpointDiffQuery,
@@ -41,16 +41,17 @@ const make = Effect.gen(function* () {
         return emptyDiff;
       }
 
-      const snapshot = yield* projectionSnapshotQuery.getSnapshot();
-      const thread = snapshot.threads.find((entry) => entry.id === input.threadId);
-      if (!thread) {
+      const threadContext = yield* projectionSnapshotQuery.getThreadCheckpointContext(
+        input.threadId,
+      );
+      if (Option.isNone(threadContext)) {
         return yield* new CheckpointInvariantError({
           operation,
           detail: `Thread '${input.threadId}' not found.`,
         });
       }
 
-      const maxTurnCount = thread.checkpoints.reduce(
+      const maxTurnCount = threadContext.value.checkpoints.reduce(
         (max, checkpoint) => Math.max(max, checkpoint.checkpointTurnCount),
         0,
       );
@@ -62,10 +63,7 @@ const make = Effect.gen(function* () {
         });
       }
 
-      const workspaceCwd = resolveThreadWorkspaceCwd({
-        thread,
-        projects: snapshot.projects,
-      });
+      const workspaceCwd = threadContext.value.worktreePath ?? threadContext.value.workspaceRoot;
       if (!workspaceCwd) {
         return yield* new CheckpointInvariantError({
           operation,
@@ -76,7 +74,7 @@ const make = Effect.gen(function* () {
       const fromCheckpointRef =
         input.fromTurnCount === 0
           ? checkpointRefForThreadTurn(input.threadId, 0)
-          : thread.checkpoints.find(
+          : threadContext.value.checkpoints.find(
               (checkpoint) => checkpoint.checkpointTurnCount === input.fromTurnCount,
             )?.checkpointRef;
       if (!fromCheckpointRef) {
@@ -87,7 +85,7 @@ const make = Effect.gen(function* () {
         });
       }
 
-      const toCheckpointRef = thread.checkpoints.find(
+      const toCheckpointRef = threadContext.value.checkpoints.find(
         (checkpoint) => checkpoint.checkpointTurnCount === input.toTurnCount,
       )?.checkpointRef;
       if (!toCheckpointRef) {