first version which seems to run

tina/database.ts

@@ -0,0 +1,47 @@
+import {
+  createDatabase,
+  createLocalDatabase,
+  FilesystemBridge,
+} from "@tinacms/datalayer";
+import { RedisLevel } from "upstash-redis-level";
+import { Redis } from "@upstash/redis";
+import { GiteaGitProvider } from "./gitea-git-provider";
+
+const isLocal = process.env.TINA_PUBLIC_IS_LOCAL === "true";
+const branch = process.env.TINA_GIT_BRANCH || "main";
+
+function createProductionDatabase() {
+  const giteaUrl = process.env.GITEA_URL;
+  const giteaToken = process.env.GITEA_TOKEN;
+  const giteaOwner = process.env.GITEA_OWNER;
+  const giteaRepo = process.env.GITEA_REPO;
+  const kvUrl = process.env.KV_REST_API_URL;
+  const kvToken = process.env.KV_REST_API_TOKEN;
+
+  if (!giteaUrl || !giteaToken || !giteaOwner || !giteaRepo) {
+    // During tinacms build (schema generation), env vars may not be available.
+    // Fall back to local database for the build step.
+    return createLocalDatabase();
+  }
+
+  return createDatabase({
+    gitProvider: new GiteaGitProvider({
+      owner: giteaOwner,
+      repo: giteaRepo,
+      token: giteaToken,
+      branch,
+      baseUrl: giteaUrl,
+    }),
+    databaseAdapter: new RedisLevel<string, Record<string, unknown>>({
+      redis: new Redis({
+        url: kvUrl || "http://localhost:8079",
+        token: kvToken || "example_token",
+      }) as any,
+      debug: process.env.DEBUG === "true" || false,
+    }),
+    bridge: new FilesystemBridge(process.cwd()),
+    namespace: branch,
+  });
+}
+
+export default isLocal ? createLocalDatabase() : createProductionDatabase();