diff --git a/modules/core/migrations/000-core.js b/modules/core/migrations/000-core.js
index 100fd7f9d..ce2bde832 100644
--- a/modules/core/migrations/000-core.js
+++ b/modules/core/migrations/000-core.js
@@ -82,10 +82,11 @@ exports.up = async knex => {
     table.specificType( 'path', 'ltree' )
   } )
 
-  await knex.schema.createTable( 'object_children', table => {
+  await knex.schema.createTable( 'object_children_closure', table => {
     table.string( 'parent' ).notNullable( )
     table.string( 'child' ).notNullable( )
-    table.index( [ 'parent', 'child' ], 'pc_index' )
+    table.integer( 'minDepth' ).defaultTo( 1 ).notNullable()
+    // table.index( [ 'parent', 'child' ], 'pc_index' )
   } )
 
   await knex.raw( `CREATE INDEX tree_path_idx ON object_tree_refs USING gist(path)` )
@@ -140,7 +141,7 @@ exports.down = async knex => {
   await knex.schema.dropTableIfExists( 'user_commits' )
   await knex.schema.dropTableIfExists( 'references' )
   await knex.schema.dropTableIfExists( 'object_tree_refs' )
-  await knex.schema.dropTableIfExists( 'object_children' )
+  await knex.schema.dropTableIfExists( 'object_children_closure' )
   await knex.schema.dropTableIfExists( 'objects' )
   await knex.schema.dropTableIfExists( 'streams' )
   await knex.schema.dropTableIfExists( 'api_tokens' )
diff --git a/modules/core/tests/objects.spec.js b/modules/core/tests/objects.spec.js
index c1cab34b8..57a968076 100644
--- a/modules/core/tests/objects.spec.js
+++ b/modules/core/tests/objects.spec.js
@@ -14,6 +14,9 @@ const { createUser, createToken, revokeToken, revokeTokenById, validateToken, ge
 const { createStream, getStream, updateStream, deleteStream, getStreamsUser, grantPermissionsStream, revokePermissionsStream } = require( '../streams/services' )
 const { createCommit, createObject, createObjects, getObject, getObjects, getObjectChildren } = require( '../objects/services' )
 
+const sampleObjects = require( './sampleObjectData' )
+// console.log( sampleObjects )
+
 let sampleCommit = JSON.parse( `{
   "Objects": [
     {
@@ -168,7 +171,8 @@ describe( 'Objects', ( ) => {
             nextNest: {
               really: 'cool'
             }
-          }
+          },
+          __tree: [ ]
         } )
 
         // if ( i % 2 === 0 )
@@ -186,10 +190,14 @@ describe( 'Objects', ( ) => {
           }
 
           objs[ i ].__tree = __tree
+        } else if ( i < objectCount - 2 ) {
+          objs[ i ].__tree.push( `${i}_hash.${i+1}_hash` )
         }
       }
-
-      // console.log( objs )
+      let print = objs.slice( 1, 10 )
+      let ttree1 = objs[ 0 ].__tree.slice( 0, 30 )
+      console.log( ttree1 )
+      console.log( print.map( o => ( { id: o.id, tree: o.__tree } ) ) )
       let ids = await createObjects( objs )
       // console.log( ids )
 
diff --git a/modules/core/tests/sampleObjectData.js b/modules/core/tests/sampleObjectData.js
new file mode 100644
index 000000000..7c74271e9
--- /dev/null
+++ b/modules/core/tests/sampleObjectData.js
@@ -0,0 +1,87 @@
+module.exports = JSON.parse( `[
+{
+  "name": "depth five",
+  "hash": "99b77f596443d2a2cf59124dbc6a4a8f",
+  "speckle_type": ""
+}, {
+  "name": "depth four",
+  "@detach": {
+    "speckle_type": "reference",
+    "referencedId": "99b77f596443d2a2cf59124dbc6a4a8f"
+  },
+  "hash": "c2cdd8d01c219703926f7282db700e14",
+  "speckle_type": "",
+  "__tree": [
+    "c2cdd8d01c219703926f7282db700e14.99b77f596443d2a2cf59124dbc6a4a8f"
+  ],
+  "__closure": {
+    "99b77f596443d2a2cf59124dbc6a4a8f": 1
+  }
+}, {
+  "name": "depth three",
+  "@detach": {
+    "speckle_type": "reference",
+    "referencedId": "c2cdd8d01c219703926f7282db700e14"
+  },
+  "hash": "78af2314eed937c7338fccc4224393c0",
+  "speckle_type": "",
+  "__tree": [
+    "78af2314eed937c7338fccc4224393c0.c2cdd8d01c219703926f7282db700e14",
+    "78af2314eed937c7338fccc4224393c0.c2cdd8d01c219703926f7282db700e14.99b77f596443d2a2cf59124dbc6a4a8f"
+  ],
+  "__closure": {
+    "c2cdd8d01c219703926f7282db700e14": 1,
+    "99b77f596443d2a2cf59124dbc6a4a8f": 2
+  }
+}, {
+  "name": "depth two",
+  "@detach": {
+    "speckle_type": "reference",
+    "referencedId": "78af2314eed937c7338fccc4224393c0"
+  },
+  "@joker": [
+    {
+      "speckle_type": "reference",
+      "referencedId": "99b77f596443d2a2cf59124dbc6a4a8f"
+    }
+  ],
+  "hash": "254cb2d7094eca3c809cdac2ffc4010b",
+  "speckle_type": "",
+  "__tree": [
+    "254cb2d7094eca3c809cdac2ffc4010b.78af2314eed937c7338fccc4224393c0",
+    "254cb2d7094eca3c809cdac2ffc4010b.78af2314eed937c7338fccc4224393c0.c2cdd8d01c219703926f7282db700e14",
+    "254cb2d7094eca3c809cdac2ffc4010b.78af2314eed937c7338fccc4224393c0.c2cdd8d01c219703926f7282db700e14.99b77f596443d2a2cf59124dbc6a4a8f",
+    "254cb2d7094eca3c809cdac2ffc4010b.99b77f596443d2a2cf59124dbc6a4a8f"
+  ],
+  "__closure": {
+    "78af2314eed937c7338fccc4224393c0": 1,
+    "c2cdd8d01c219703926f7282db700e14": 2,
+    "99b77f596443d2a2cf59124dbc6a4a8f": 1
+  }
+}, {
+  "name": "depth one",
+  "@detach": {
+    "speckle_type": "reference",
+    "referencedId": "254cb2d7094eca3c809cdac2ffc4010b"
+  },
+  "@joker": {
+    "speckle_type": "reference",
+    "referencedId": "99b77f596443d2a2cf59124dbc6a4a8f"
+  },
+  "hash": "d2b9e647cb345673ff2b35ccab45ffc2",
+  "speckle_type": "",
+  "__tree": [
+    "d2b9e647cb345673ff2b35ccab45ffc2.254cb2d7094eca3c809cdac2ffc4010b",
+    "d2b9e647cb345673ff2b35ccab45ffc2.254cb2d7094eca3c809cdac2ffc4010b.78af2314eed937c7338fccc4224393c0",
+    "d2b9e647cb345673ff2b35ccab45ffc2.254cb2d7094eca3c809cdac2ffc4010b.78af2314eed937c7338fccc4224393c0.c2cdd8d01c219703926f7282db700e14",
+    "d2b9e647cb345673ff2b35ccab45ffc2.254cb2d7094eca3c809cdac2ffc4010b.78af2314eed937c7338fccc4224393c0.c2cdd8d01c219703926f7282db700e14.99b77f596443d2a2cf59124dbc6a4a8f",
+    "d2b9e647cb345673ff2b35ccab45ffc2.254cb2d7094eca3c809cdac2ffc4010b.99b77f596443d2a2cf59124dbc6a4a8f",
+    "d2b9e647cb345673ff2b35ccab45ffc2.99b77f596443d2a2cf59124dbc6a4a8f"
+  ],
+  "__closure": {
+    "254cb2d7094eca3c809cdac2ffc4010b": 1,
+    "78af2314eed937c7338fccc4224393c0": 2,
+    "c2cdd8d01c219703926f7282db700e14": 3,
+    "99b77f596443d2a2cf59124dbc6a4a8f": 1
+  }
+} ]` )
\ No newline at end of file