diff --git a/src/core/url-utils.ts b/src/core/url-utils.ts
new file mode 100644
index 0000000..3fba1d9
--- /dev/null
+++ b/src/core/url-utils.ts
@@ -0,0 +1,5 @@
+export function joinUrl(base: string, pathname: string): string {
+  const normalizedBase = base.endsWith("/") ? base : `${base}/`;
+  const normalizedPath = pathname.replace(/^\/+/, "");
+  return new URL(normalizedPath, normalizedBase).toString();
+}
diff --git a/src/queue/processes/downloadRepository.worker.js b/src/queue/processes/downloadRepository.worker.js
new file mode 100644
index 0000000..43af4ad
--- /dev/null
+++ b/src/queue/processes/downloadRepository.worker.js
@@ -0,0 +1,3 @@
+/* global module, require */
+require("ts-node/register/transpile-only");
+module.exports = require("./downloadRepository.ts").default;
diff --git a/src/queue/processes/removeCache.worker.js b/src/queue/processes/removeCache.worker.js
new file mode 100644
index 0000000..e9177cf
--- /dev/null
+++ b/src/queue/processes/removeCache.worker.js
@@ -0,0 +1,3 @@
+/* global module, require */
+require("ts-node/register/transpile-only");
+module.exports = require("./removeCache.ts").default;
diff --git a/src/queue/processes/removeRepository.worker.js b/src/queue/processes/removeRepository.worker.js
new file mode 100644
index 0000000..62f23ad
--- /dev/null
+++ b/src/queue/processes/removeRepository.worker.js
@@ -0,0 +1,3 @@
+/* global module, require */
+require("ts-node/register/transpile-only");
+module.exports = require("./removeRepository.ts").default;
diff --git a/src/queue/worker-path.ts b/src/queue/worker-path.ts
new file mode 100644
index 0000000..5b760c1
--- /dev/null
+++ b/src/queue/worker-path.ts
@@ -0,0 +1,27 @@
+import { existsSync } from "fs";
+import { resolve } from "path";
+
+const PROCESSOR_PATHS = {
+  downloadRepository: {
+    build: resolve("build/queue/processes/downloadRepository.js"),
+    source: resolve("src/queue/processes/downloadRepository.worker.js"),
+  },
+  removeCache: {
+    build: resolve("build/queue/processes/removeCache.js"),
+    source: resolve("src/queue/processes/removeCache.worker.js"),
+  },
+  removeRepository: {
+    build: resolve("build/queue/processes/removeRepository.js"),
+    source: resolve("src/queue/processes/removeRepository.worker.js"),
+  },
+} as const;
+
+export type WorkerProcessorName = keyof typeof PROCESSOR_PATHS;
+
+export function resolveWorkerProcessorPath(
+  name: WorkerProcessorName,
+  fileExists: (path: string) => boolean = existsSync
+): string {
+  const processor = PROCESSOR_PATHS[name];
+  return fileExists(processor.build) ? processor.build : processor.source;
+}
diff --git a/src/server/routes/pullRequest-private.ts b/src/server/routes/pullRequest-private.ts
index e620604..ae2deb1 100644
--- a/src/server/routes/pullRequest-private.ts
+++ b/src/server/routes/pullRequest-private.ts
@@ -275,7 +275,7 @@ router.post("/", async (req, res) => {
     pullRequest.source.repositoryFullName =
       pullRequestUpdate.source.repositoryFullName;
 
-    pullRequest.conference = pullRequestUpdate.conference;
+    pullRequest.model.conference = pullRequestUpdate.conference;
 
     await pullRequest.model.save();
     await pullRequest.anonymize();
diff --git a/test/runtime-regressions.test.js b/test/runtime-regressions.test.js
new file mode 100644
index 0000000..cd6e635
--- /dev/null
+++ b/test/runtime-regressions.test.js
@@ -0,0 +1,237 @@
+require("ts-node/register/transpile-only");
+
+const path = require("path");
+const { expect } = require("chai");
+
+const Repository = require("../src/core/Repository").default;
+const PullRequest = require("../src/core/PullRequest").default;
+const PullRequestModel = require("../src/core/model/anonymizedPullRequests/anonymizedPullRequests.model").default;
+const github = require("../src/core/GitHubUtils");
+const githubApp = require("../src/core/github-app");
+const routeUtils = require("../src/server/routes/route-utils");
+const GitHubStream = require("../src/core/source/GitHubStream").default;
+const {
+  RepositoryStatus,
+} = require("../src/core/types");
+const { joinUrl } = require("../src/core/url-utils");
+const pullRequestRouter = require("../src/server/routes/pullRequest-private").default;
+const {
+  resolveWorkerProcessorPath,
+} = require("../src/queue/worker-path");
+
+describe("Runtime regression fixes", function () {
+  const restores = [];
+  function stub(object, key, value) {
+    const original = object[key];
+    restores.push(() => { object[key] = original; });
+    object[key] = value;
+  }
+  afterEach(() => { while (restores.length) restores.pop()(); });
+
+  describe("joinUrl", function () {
+    it("preserves the double slash in https URLs", function () {
+      expect(joinUrl("https://streamer.example.com", "api/download")).to.equal(
+        "https://streamer.example.com/api/download"
+      );
+    });
+
+    it("handles base URLs that already end with a slash", function () {
+      expect(joinUrl("http://localhost:3000/", "/api")).to.equal(
+        "http://localhost:3000/api"
+      );
+    });
+  });
+
+  describe("PullRequest.download()", function () {
+    it("uses the authenticated GitHub API diff endpoint", async function () {
+      const pullRequest = new PullRequest(new PullRequestModel({
+        source: { repositoryFullName: "owner/repo", pullRequestId: 42 },
+      }));
+      pullRequest.getToken = async () => "secret-token";
+      const requests = [];
+      const tokens = [];
+      stub(github, "octokit", token => {
+        tokens.push(token);
+        return {
+          rest: { pulls: { get: async options => {
+            requests.push(options);
+            return { data: options.mediaType?.format === "diff" ? "private diff" : {
+              title: "Private PR", base: { repo: { full_name: "owner/repo" } }, head: {},
+            } };
+          } } },
+          paginate: async () => [],
+        };
+      });
+
+      await pullRequest.download();
+
+      expect(tokens).to.deep.equal(["secret-token"]);
+      expect(requests).to.deep.equal([
+        { owner: "owner", repo: "repo", pull_number: 42 },
+        { owner: "owner", repo: "repo", pull_number: 42, mediaType: { format: "diff" } },
+      ]);
+      expect(pullRequest.model.pullRequest.diff).to.equal("private diff");
+    });
+  });
+
+  describe("POST / pull request creation", function () {
+    it("stores the conference on the persisted model", async function () {
+      const update = {
+        pullRequestId: "anon-pr-1",
+        conference: "conf-2026",
+        source: {
+          repositoryFullName: "owner/repo",
+          pullRequestId: 123,
+        },
+        options: {
+          expirationMode: "never",
+        },
+        terms: [],
+      };
+      const user = {
+        id: "507f191e810c19729de860ea",
+      };
+      const saved = [];
+      let response;
+      let anonymized = false;
+      stub(routeUtils, "getUser", async () => user);
+      stub(routeUtils, "handleError", error => { throw error; });
+      stub(githubApp, "selectRepositoryAccess", async () => ({ binding: { kind: "oauth" } }));
+      stub(PullRequestModel.prototype, "save", async function () {
+        saved.push(this.toObject());
+        return this;
+      });
+      stub(PullRequest.prototype, "anonymize", async function () {
+        expect(saved).to.have.length(1);
+        anonymized = true;
+      });
+      const route = pullRequestRouter.stack.find(layer =>
+        layer.route?.path === "/" && layer.route.methods.post).route;
+
+      await route.stack[0].handle({ body: update }, { send: value => { response = value; } });
+
+      expect(saved).to.have.length(1);
+      expect(saved[0].conference).to.equal("conf-2026");
+      expect(saved[0].source.repositoryFullName).to.equal("owner/repo");
+      expect(saved[0].source.pullRequestId).to.equal(123);
+      expect(response.conference).to.equal("conf-2026");
+      expect(anonymized).to.equal(true);
+    });
+  });
+
+  describe("Repository.check()", function () {
+    it("records logical expiration before throwing repository_expired", async function () {
+      const repo = new Repository({
+        owner: "507f191e810c19729de860ea",
+        options: {
+          expirationMode: "date",
+          expirationDate: new Date(Date.now() - 1000),
+        },
+        status: RepositoryStatus.READY,
+        statusDate: new Date(),
+        source: {
+          repositoryName: "owner/repo",
+          type: "GitHubStream",
+        },
+      });
+
+      let expired = false;
+      repo.markExpired = async function () {
+        await Promise.resolve();
+        expired = true;
+        this.model.status = RepositoryStatus.EXPIRED;
+      };
+
+      try {
+        await repo.check();
+        throw new Error("expected Repository.check() to throw");
+      } catch (error) {
+        expect(error.message).to.equal("repository_expired");
+      }
+
+      expect(expired).to.equal(true);
+    });
+  });
+
+  describe("GitHubStream.getTruncatedTree()", function () {
+    it("recursively refetches truncated subtrees", async function () {
+      const source = new GitHubStream({
+        repoId: "repo-1",
+        organization: "owner",
+        repoName: "repo",
+        commit: "head",
+        getToken: async () => "token",
+      });
+
+      const calls = [];
+      source.tree2Tree = function (tree, parentPath = "") {
+        return tree.map((entry) =>
+          path.posix.join(parentPath, entry.path || "")
+        );
+      };
+      source.getGHTree = async function (_oct, _token, sha, _count, opt) {
+        calls.push({ sha, recursive: opt.recursive === true });
+        if (sha === "head" && opt.recursive) return { tree: [], truncated: true };
+        if (sha === "head") {
+          return {
+            tree: [{ type: "tree", path: "src", sha: "src-sha" }],
+            truncated: false,
+          };
+        }
+        if (sha === "src-sha" && opt.recursive === true) {
+          return {
+            tree: [],
+            truncated: true,
+          };
+        }
+        if (sha === "src-sha" && opt.recursive === false) {
+          return {
+            tree: [{ type: "tree", path: "deep", sha: "deep-sha" }],
+            truncated: false,
+          };
+        }
+        if (sha === "deep-sha" && opt.recursive === true) {
+          return {
+            tree: [{ type: "blob", path: "file.ts", sha: "file-sha" }],
+            truncated: false,
+          };
+        }
+        throw new Error(`unexpected request: ${sha}:${opt.recursive}`);
+      };
+
+      const files = await source.getTruncatedTree("head");
+
+      expect(files).to.deep.equal(["src", "src/deep", "src/deep/file.ts"]);
+      expect(calls).to.deep.equal([
+        { sha: "head", recursive: true },
+        { sha: "head", recursive: false },
+        { sha: "src-sha", recursive: true },
+        { sha: "src-sha", recursive: false },
+        { sha: "deep-sha", recursive: true },
+      ]);
+    });
+  });
+
+  describe("resolveWorkerProcessorPath", function () {
+    it("falls back to the source-mode worker wrapper when build output is missing", function () {
+      const resolved = resolveWorkerProcessorPath(
+        "downloadRepository",
+        () => false
+      );
+
+      expect(resolved).to.equal(
+        path.resolve("src/queue/processes/downloadRepository.worker.js")
+      );
+    });
+
+    it("prefers the built worker script when it exists", function () {
+      const resolved = resolveWorkerProcessorPath("removeCache", (candidate) =>
+        candidate.endsWith(path.join("build", "queue", "processes", "removeCache.js"))
+      );
+
+      expect(resolved).to.equal(
+        path.resolve("build/queue/processes/removeCache.js")
+      );
+    });
+  });
+});