diff --git a/core/lib/Drupal/Core/Database/database.api.php b/core/lib/Drupal/Core/Database/database.api.php
index 3ab85bfdfa..9b43be0144 100644
--- a/core/lib/Drupal/Core/Database/database.api.php
+++ b/core/lib/Drupal/Core/Database/database.api.php
@@ -249,17 +249,14 @@
  * The following keys are defined:
  *   - 'description': A string in non-markup plain text describing this table
  *     and its purpose. References to other tables should be enclosed in
- *     curly-brackets. For example, the node_field_revision table
- *     description field might contain "Stores per-revision title and
- *     body data for each {node}."
+ *     curly-brackets.
  *   - 'fields': An associative array ('fieldname' => specification)
  *     that describes the table's database columns. The specification
  *     is also an array. The following specification parameters are defined:
  *     - 'description': A string in non-markup plain text describing this field
  *       and its purpose. References to other tables should be enclosed in
- *       curly-brackets. For example, the node table vid field
- *       description might contain "Always holds the largest (most
- *       recent) {node_field_revision}.vid value for this nid."
+ *       curly-brackets. For example, the users_data table uid field
+ *       description might contain "Primary key: {users}.uid for user."
  *     - 'type': The generic datatype: 'char', 'varchar', 'text', 'blob', 'int',
  *       'float', 'numeric', or 'serial'. Most types just map to the according
  *       database engine specific data types. Use 'serial' for auto incrementing
@@ -492,60 +489,56 @@ function hook_query_TAG_alter(Drupal\Core\Database\Query\AlterableInterface $que
  * @ingroup schemaapi
  */
 function hook_schema() {
-  $schema['node'] = [
-    // Example (partial) specification for table "node".
-    'description' => 'The base table for nodes.',
+  $schema['users_data'] = [
+    'description' => 'Stores module data as key/value pairs per user.',
     'fields' => [
-      'nid' => [
-        'description' => 'The primary identifier for a node.',
-        'type' => 'serial',
-        'unsigned' => TRUE,
-        'not null' => TRUE,
-      ],
-      'vid' => [
-        'description' => 'The current {node_field_revision}.vid version identifier.',
+      'uid' => [
+        'description' => 'Primary key: {users}.uid for user.',
         'type' => 'int',
         'unsigned' => TRUE,
         'not null' => TRUE,
         'default' => 0,
       ],
-      'type' => [
-        'description' => 'The type of this node.',
-        'type' => 'varchar',
-        'length' => 32,
+      'module' => [
+        'description' => 'The name of the module declaring the variable.',
+        'type' => 'varchar_ascii',
+        'length' => DRUPAL_EXTENSION_NAME_MAX_LENGTH,
         'not null' => TRUE,
         'default' => '',
       ],
-      'title' => [
-        'description' => 'The node title.',
-        'type' => 'varchar',
-        'length' => 255,
+      'name' => [
+        'description' => 'The identifier of the data.',
+        'type' => 'varchar_ascii',
+        'length' => 128,
         'not null' => TRUE,
         'default' => '',
       ],
+      'value' => [
+        'description' => 'The value.',
+        'type' => 'blob',
+        'not null' => FALSE,
+        'size' => 'big',
+      ],
+      'serialized' => [
+        'description' => 'Whether value is serialized.',
+        'type' => 'int',
+        'size' => 'tiny',
+        'unsigned' => TRUE,
+        'default' => 0,
+      ],
     ],
+    'primary key' => ['uid', 'module', 'name'],
     'indexes' => [
-      'node_changed'        => ['changed'],
-      'node_created'        => ['created'],
-    ],
-    'unique keys' => [
-      'nid_vid' => ['nid', 'vid'],
-      'vid'     => ['vid'],
+      'module' => ['module'],
+      'name' => ['name'],
     ],
     // For documentation purposes only; foreign keys are not created in the
     // database.
     'foreign keys' => [
-      'node_revision' => [
-        'table' => 'node_field_revision',
-        'columns' => ['vid' => 'vid'],
-      ],
-      'node_author' => [
-        'table' => 'users',
-        'columns' => ['uid' => 'uid'],
-      ],
+      'uid' => ['users' => 'uid'],
     ],
-    'primary key' => ['nid'],
   ];
+
   return $schema;
 }