test: added gel but haven't tested

packages/tome/.envrc

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+use flake .#tome

packages/tome/default.nix

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+{ inputs, ... }:
+{
+  perSystem =
+    { pkgs, ... }:
+    {
+      devShells.tome = pkgs.mkShell {
+        buildInputs = builtins.attrValues {
+          inherit (inputs.gel.packages."x86_64-linux") gel-cli gel-ls;
+        };
+      };
+
+      packages.tome = pkgs.stdenv.mkDerivation {
+        installPhase = ''
+          mkdir -p $out
+          cp -r dbschema $out/
+          cp gel.toml $out/
+        '';
+        name = "tome";
+        src = ./src;
+      };
+    };
+}

packages/tome/src/dbschema/default.gel

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+module default {
+  scalar type SubscriptionStatus extending enum
+    Active,
+    Cancelled,
+    PastDue,
+    Trialing
+  >;
+
+  type User {
+    required email: str {
+      constraint exclusive;
+    }
+    required password_hash: str;
+    required created_at: datetime {
+      default := datetime_of_statement();
+    }
+    subscription: Subscription;
+  }
+
+  type Subscription {
+    required user: User {
+      constraint exclusive;
+    }
+    required stripe_customer_id: str {
+      constraint exclusive;
+    }
+    required status: SubscriptionStatus;
+    required current_period_end: datetime;
+    plan_id: str;
+  }
+
+  type Session {
+    required user: User;
+    required token: str {
+      constraint exclusive;
+    }
+    required expires_at: datetime;
+    required created_at: datetime {
+      default := datetime_of_statement();
+    }
+  }
+}

packages/tome/src/gel.toml

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+[instance]
+server-version = "6.11"