diff --git a/client/data/resources/database.dbml b/client/data/resources/database.dbml
index 9541db4..befc143 100644
--- a/client/data/resources/database.dbml
+++ b/client/data/resources/database.dbml
@@ -7,8 +7,12 @@ Table user {
 }
 
 Table posture {
+    id INTEGER [primary key, unique, increment]
     user_id INTEGER [ref: > user.id]
-    prop_good REAL 
+    
+    // Proportion of time that posture is good within period 
+    prop_good REAL
+
     period_start DATETIME
     period_end DATETIME
 }
\ No newline at end of file
diff --git a/client/data/routines.py b/client/data/routines.py
index 0297aa3..ff929fe 100644
--- a/client/data/routines.py
+++ b/client/data/routines.py
@@ -1,11 +1,11 @@
-"""Routines that can be integrated into main control flow."""
+"""Data routines that can be integrated into main control flow."""
 
 import sqlite3
 from typing import Any
 from importlib import resources
 from pydbml import PyDBML
 
-DATABASE_DEFINTION = resources.files("data.resources").joinpath("database.dbml")
+DATABASE_DEFINITION = resources.files("data.resources").joinpath("database.dbml")
 DATABASE_RESOURCE = resources.files("data.resources").joinpath("database.db")
 
 
@@ -16,7 +16,7 @@ def init_database() -> None:
         if database_file.is_file():
             return
 
-        parsed = PyDBML(DATABASE_DEFINTION)
+        parsed = PyDBML(DATABASE_DEFINITION)
         init_script = parsed.sql
 
         connection = sqlite3.connect(database_file)