diff --git a/packages/das/src/api/admin.controller.ts b/packages/das/src/api/admin.controller.ts
index 2999c2f..05c4f74 100644
--- a/packages/das/src/api/admin.controller.ts
+++ b/packages/das/src/api/admin.controller.ts
@@ -2,6 +2,7 @@ import {
   BadRequestException,
   Body,
   Controller,
+  Get,
   NotFoundException,
   Post,
   UseGuards,
@@ -149,6 +150,74 @@ export class AdminController {
     };
   }
 
+  @Post("repos/deregister")
+  @ApiOperation({
+    summary: "Flip a repo to unregistered",
+    description:
+      "Sets registered=false on a repo. Keeps the row, its data, and " +
+      "installation_id intact so the repo can be re-registered later.",
+  })
+  @ApiBody({
+    schema: {
+      type: "object",
+      required: ["repoFullName"],
+      properties: {
+        repoFullName: { type: "string", example: "entrius/gittensor-ui" },
+      },
+    },
+  })
+  async deregisterRepo(@Body() body: RegisterBody): Promise<{
+    repoFullName: string;
+    registered: false;
+  }> {
+    const repoFullName = validateRepoFullName(body?.repoFullName);
+
+    const repo = await this.repoRepo
+      .createQueryBuilder("repo")
+      .select(["repo.repoFullName"])
+      .where("LOWER(repo.repo_full_name) = LOWER(:repoFullName)", {
+        repoFullName,
+      })
+      .getOne();
+
+    if (!repo) {
+      throw new NotFoundException(`Repo ${repoFullName} not found`);
+    }
+
+    await this.repoRepo.update(
+      { repoFullName: repo.repoFullName },
+      { registered: false },
+    );
+
+    return { repoFullName: repo.repoFullName, registered: false };
+  }
+
+  @Get("repos")
+  @ApiOperation({
+    summary: "List all repo rows",
+    description:
+      "Returns every repo row with its registration state and whether a " +
+      "GitHub App installation is attached. Sorted by repoFullName.",
+  })
+  async listRepos(): Promise<
+    Array<{
+      repoFullName: string;
+      registered: boolean;
+      hasInstallation: boolean;
+    }>
+  > {
+    const repos = await this.repoRepo.find({
+      select: ["repoFullName", "registered", "installationId"],
+      order: { repoFullName: "ASC" },
+    });
+
+    return repos.map((repo) => ({
+      repoFullName: repo.repoFullName,
+      registered: repo.registered,
+      hasInstallation: repo.installationId !== null,
+    }));
+  }
+
   /** Resolve the canonical repos PK after a case-insensitive match. */
   private async resolveInstalledRepoFullName(
     repoFullName: string,