refactor(better-auth): replace raw OData fetch with fmodata Database

.changeset/better-auth-fmodata-adapter.md

@@ -0,0 +1,9 @@
+---
+"@proofkit/better-auth": minor
+"@proofkit/fmodata": patch
+---
+
+BREAKING(@proofkit/better-auth): Use fmodata Database object instead of raw OData config.
+Config now requires `database` (fmodata Database instance) instead of
+`odata: { serverUrl, auth, database }`.
+Enables fetch override via FMServerConnection's fetchClientOptions.

apps/docs/content/docs/better-auth/installation.mdx

@@ -24,36 +24,38 @@ This automated setup expects you to have Next.js and shadcn/ui set up in your pr
 
 Run the following command to add the necessary packages and config files to your project. You will not need to follow the better-auth installation guide.
 <CliCommand command="add better-auth" exec />
- 
+
 # Step 1b: Manual Setup
 
 Follow the [Better-Auth installation guide](https://better-auth.com/docs/installation) to get started in your app, but come back here for special instructions for anything related to your Database Setup or schema migrations.
 
 ### Database Setup
 
-Ensure you have the @proofkit/better-auth package installed in your app.
-<PackageInstall packages="@proofkit/better-auth" />
+Ensure you have the @proofkit/better-auth and @proofkit/fmodata packages installed in your app.
+<PackageInstall packages="@proofkit/better-auth @proofkit/fmodata" />
 
 Configure your database connection in your `auth.ts` file. Be sure to set these value secrets in your environment variables. The credentials you use here need `fmodata` permissions enabled, and read/write access to the better-auth tables.
 ```ts title="auth.ts"
 import { betterAuth } from "better-auth";
+import { FMServerConnection } from "@proofkit/fmodata";
 import { FileMakerAdapter } from "@proofkit/better-auth";
 
+const connection = new FMServerConnection({
+  serverUrl: process.env.FM_SERVER_URL!,
+  auth: {
+    // option 1: username/password credentials
+    username: process.env.FM_USERNAME!,
+    password: process.env.FM_PASSWORD!,
+
+    // option 2: Data API key (OttoFMS 4.11+, OData enabled for the key)
+    // apiKey: process.env.OTTO_API_KEY!,
+  },
+});
+
+const db = connection.database(process.env.FM_DATABASE!);
+
 export const auth = betterAuth({
-  database: FileMakerAdapter({
-    odata: {
-      serverUrl: process.env.FM_SERVER_URL,
-      auth: {
-        // option 1: username/password credentials
-        username: process.env.FM_USERNAME,
-        password: process.env.FM_PASSWORD,
-
-        // option 2: Data API key (OttoFMS 4.11+, OData enabled for the key)
-        // apiKey: process.env.OTTO_API_KEY,
-      },
-      database: process.env.FM_DATABASE,
-    },
-  }),
+  database: FileMakerAdapter({ database: db }),
   // ...rest of your config
 });
 ```

packages/better-auth/package.json

@@ -51,24 +51,21 @@
     "@babel/preset-react": "^7.28.5",
     "@babel/preset-typescript": "^7.28.5",
     "@commander-js/extra-typings": "^14.0.0",
+    "@proofkit/fmodata": "workspace:*",
     "@tanstack/vite-config": "^0.2.1",
     "better-auth": "^1.4.11",
     "c12": "^3.3.3",
     "chalk": "5.4.1",
     "commander": "^14.0.2",
     "dotenv": "^16.6.1",
     "fs-extra": "^11.3.3",
-    "neverthrow": "^8.2.0",
-    "odata-query": "^8.0.7",
     "prompts": "^2.4.2",
-    "vite": "^6.4.1",
-    "zod": "^4.3.5"
+    "vite": "^6.4.1"
   },
   "devDependencies": {
     "@types/fs-extra": "^11.0.4",
     "@types/prompts": "^2.4.9",
     "@vitest/ui": "^3.2.4",
-    "fm-odata-client": "^3.0.2",
     "publint": "^0.3.16",
     "typescript": "^5.9.3",
     "vitest": "^4.0.17"