fixup! tapdb: add supply_tree.md documentation for supply tree

Author: Roasbeef

tapdb/supply_tree.md

@@ -31,27 +31,29 @@ The persistence layer utilizes two main tables, introduced in migration `000035_
 erDiagram
     universe_supply_roots ||--o{ universe_supply_leaves : contains
     universe_supply_roots }|--|| mssmt_roots : uses_namespace
-    universe_supply_leaves }|..|| mssmt_nodes : points_to_subtree_root
-
+    universe_supply_leaves }|--|| mssmt_nodes : points_to_subtree_root
+    universe_supply_leaves }|--|| proof_types : has_type
+    universe_supply_roots ||--o| asset_groups : conceptual_link
+    
     universe_supply_roots {
         INTEGER id PK
         VARCHAR namespace_root UK "FK(mssmt_roots.namespace)"
         BLOB group_key UK
     }
-
+    
     universe_supply_leaves {
         INTEGER id PK
         BIGINT supply_root_id FK
         TEXT sub_tree_type "FK(proof_types.proof_type)"
         BLOB leaf_node_key
         VARCHAR leaf_node_namespace "Namespace for sub-tree in mssmt_nodes"
     }
-
+    
     mssmt_roots {
         VARCHAR namespace PK
         BLOB root_hash "FK(mssmt_nodes.hash_key, mssmt_nodes.namespace)"
     }
-
+    
     mssmt_nodes {
         BLOB hash_key PK
         VARCHAR namespace PK
@@ -61,19 +63,20 @@ erDiagram
         BLOB value
         BIGINT sum
     }
-
+    
     proof_types {
         TEXT proof_type PK
     }
 
-    %% Conceptual Link
-    universe_supply_roots ||--o| asset_groups : represents_group (conceptual)
     asset_groups {
         INTEGER group_id PK
         BLOB tweaked_group_key UK
-        %% ... other columns
+        BLOB tapscript_root "NULL"
+        BIGINT internal_key_id FK "REFERENCES internal_keys(key_id)"
+        BIGINT genesis_point_id FK "REFERENCES genesis_points(genesis_id)"
+        INTEGER version
+        INTEGER custom_subtree_root_id FK "REFERENCES tapscript_roots(root_id) NULL"
     }
-
 ```
 *Note: The link between `universe_supply_leaves` and `mssmt_nodes` is indirect. The `leaf_node_namespace` identifies the sub-tree, and the actual sub-tree root node's hash and sum are stored as the `value` and `sum` of the leaf node identified by `leaf_node_key` within the *root* tree's namespace (`universe_supply_roots.namespace_root`).*