diff --git a/pyproject.toml b/pyproject.toml
index 4bd8399..61b25b5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,6 +17,8 @@ flask = "*"
 tinydb = "^4.8.2"
 pyyaml = "^6.0.2"
 nanoid = "^2.0.0"
+# grung-db = {git = "https://git.evilchi.li/evilchili/grung-db.git"}
+grung-db = {git = "file:///home/greg/dev/grung-db/"}
 
 [tool.poetry.group.dev.dependencies]
 pytest = "*"
diff --git a/src/ttfrog/app.py b/src/ttfrog/app.py
index 13e944e..b9cb9a7 100644
--- a/src/ttfrog/app.py
+++ b/src/ttfrog/app.py
@@ -2,21 +2,25 @@ import os
 import sys
 
 from flask import Flask
+from grung.db import GrungDB
 from tinydb.storages import MemoryStorage
 
-from ttfrog.db import Database
+from ttfrog import schema
 
 
 class ApplicationContext:
     def __init__(self):
         self.web: Flask = Flask("ttfrog")
-        self.db: Database = Database(storage=MemoryStorage)
+        self.db: GrungDB = None
         self._initialized = False
 
-    def initialize(self, db: Database = None):
+    def initialize(self, db: GrungDB = None):
         if not self._initialized:
             self.web.config["SECRET_KEY"] = os.getenv("SECRET_KEY", "secret string")
-            self.db = db or Database("ttfrog.db.json")
+            if os.environ.get("TTFROG_IN_MEMORY_DB"):
+                self.db = GrungDB.with_schema(schema, storage=MemoryStorage)
+            else:
+                self.db = GrungDB.with_schema(schema, "ttfrog.db.json")
             self._initialized = True
 
 
diff --git a/src/ttfrog/cli.py b/src/ttfrog/cli.py
index 14d0313..368fbbc 100644
--- a/src/ttfrog/cli.py
+++ b/src/ttfrog/cli.py
@@ -19,9 +19,6 @@ LOG_LEVEL=INFO
 
 main_app = typer.Typer()
 
-_context = ttfrog.app.initialize()
-flask_app = _context.app
-
 app_state = dict(
     config_file=Path("~/.config/ttfrog.conf").expanduser(),
 )
@@ -53,6 +50,8 @@ def callback(
     )
     app_state["verbose"] = verbose
 
+    ttfrog.app.initialize()
+
     if context.invoked_subcommand is None:
         logger.debug("No command specified; invoking default handler.")
         run(context)
@@ -62,19 +61,19 @@ def run(context: typer.Context):
     """
     The default CLI entrypoint is ttfrog.cli.run().
     """
-    flask_app.run()
+    ttfrog.app.web.run()
 
 
-@flask_app.shell_context_processor
+@ttfrog.app.web.shell_context_processor
 def make_shell_context():
-    return flask_app
+    return ttfrog.app
 
 
-@click.group(cls=FlaskGroup, create_app=lambda: flask_app)
+@click.group(cls=FlaskGroup, create_app=lambda: ttfrog.app.web)
 @click.pass_context
 def app(ctx):
     """
-    Application management functions
+    Web Application management functions
     """
 
 
diff --git a/src/ttfrog/db.py b/src/ttfrog/db.py
deleted file mode 100644
index 0b7da82..0000000
--- a/src/ttfrog/db.py
+++ /dev/null
@@ -1,53 +0,0 @@
-from tinydb import TinyDB, table
-from tinydb.table import Document
-
-from ttfrog import schema
-
-
-class RecordTable(table.Table):
-    """
-    Wrapper around tinydb Tables that handles Records instead of dicts.
-    """
-
-    def __init__(self, storage, name, **kwargs):
-        self.document_class = getattr(schema, name, Document)
-        super().__init__(storage, name, **kwargs)
-
-    def insert(self, document):
-        self._satisfy_constraints(document)
-        if document.doc_id:
-            last_insert_id = super().upsert(document)[0]
-        else:
-            last_insert_id = super().insert(dict(document))
-        return self.get(doc_id=last_insert_id)
-
-    def _satisfy_constraints(self, document):
-        # check for uniqueness, etc.
-        pass
-
-
-class Database(TinyDB):
-    """
-    A TinyDB database instance that uses RecordTable instances for each table
-    and Record instances for each document in the table.
-    """
-
-    default_table_name = "Record"
-
-    def table(self, name: str, **kwargs) -> RecordTable:
-        if name not in self._tables:
-            self._tables[name] = RecordTable(self.storage, name, **kwargs)
-        return self._tables[name]
-
-    def save(self, record):
-        """
-        Create or update a record in its table.
-        """
-        return self.table(record._metadata.table).insert(record)
-
-    def __getattr__(self, attr_name):
-        """
-        Make tables attributes of the instance.
-        """
-        if attr_name in self.tables():
-            return self.table(attr_name)
diff --git a/src/ttfrog/schema.py b/src/ttfrog/schema.py
index 62597a1..16f7f14 100644
--- a/src/ttfrog/schema.py
+++ b/src/ttfrog/schema.py
@@ -1,58 +1,11 @@
-from collections import namedtuple
-from dataclasses import dataclass
+from typing import List
 
-import nanoid
-
-Metadata = namedtuple("Metadata", ["table", "fields"])
-
-
-@dataclass
-class Field:
-    """
-    Represents a single field in a Record.
-    """
-
-    name: str
-    value_type: type = str
-    default: value_type | None = None
-    unique: bool = False
-
-
-class Record(dict):
-    """
-    Base type for a single database record.
-    """
-
-    _fields = [Field("uid", default="", unique=True)]
-
-    def __init__(self, raw_doc: dict = {}, doc_id: int = None, **params):
-        # populate the metadata
-        fields = Record._fields
-        if self.__class__ != Record:
-            fields += self._fields
-        self._metadata = Metadata(table=self.__class__.__name__, fields={f.name: f for f in fields})
-
-        self.doc_id = doc_id
-
-        vals = dict({field.name: field.default for field in fields}, **raw_doc, **params)
-        if not vals["uid"]:
-            vals["uid"] = nanoid.generate(size=8)  # 1% collision rate at ~2M records
-
-        super().__init__(vals)
-
-    def __setattr__(self, key, value):
-        if key in self:
-            self[key] = value
-        super().__setattr__(key, value)
-
-    def __getattr__(self, attr_name):
-        if attr_name in self:
-            return self.get(attr_name)
-        return super().__getattr__(attr_name)
-
-    def __repr__(self):
-        return f"{self.__class__.__name__}[{self.doc_id}]: {self.items()}"
+from grung.types import Field, Record
 
 
 class User(Record):
     _fields = [Field("name"), Field("email", unique=True)]
+
+
+class Group(Record):
+    _fields = [Field("name", unique=True), Field("users", List[User])]
diff --git a/test/test_db.py b/test/test_db.py
index e254c95..fea1f96 100644
--- a/test/test_db.py
+++ b/test/test_db.py
@@ -1,19 +1,15 @@
-import os
-
 import pytest
 
 import ttfrog.app
 from ttfrog import schema
-from ttfrog.db import Database
 
 
 @pytest.fixture
-def app():
-    ttfrog.app.initialize(Database("ttfrog-tests"))
-    ttfrog.app.db.drop_tables()
+def app(monkeypatch):
+    monkeypatch.setenv("TTFROG_IN_MEMORY_DB", "1")
+    ttfrog.app.initialize()
     yield ttfrog.app
     ttfrog.app.db.close()
-    os.unlink("ttfrog-tests")
 
 
 def test_create(app):
@@ -37,3 +33,8 @@ def test_create(app):
     after_update = app.db.save(john_something)
     assert after_update == john_something
     assert before_update != after_update
+
+    players = schema.Group(name="players", users=[john_something])
+    players = app.db.save(players)
+    players.users[0]["name"] = "fnord"
+    app.db.save(players)