Support multiple unique keys in snapshots

.changes/unreleased/Features-20241001-134051.yaml

@@ -0,0 +1,6 @@
+kind: Features
+body: Enable use of multi-column unique key in snapshots
+time: 2024-10-01T13:40:51.297529-04:00
+custom:
+  Author: gshank
+  Issue: "9992"

core/dbt/artifacts/resources/v1/snapshot.py

@@ -19,7 +19,7 @@ class SnapshotMetaColumnNames(dbtClassMixin):
 class SnapshotConfig(NodeConfig):
     materialized: str = "snapshot"
     strategy: Optional[str] = None
-    unique_key: Optional[str] = None
+    unique_key: Optional[Union[str, List[str]]] = None
     target_schema: Optional[str] = None
     target_database: Optional[str] = None
     updated_at: Optional[str] = None

core/setup.py

@@ -71,7 +71,7 @@
         "dbt-extractor>=0.5.0,<=0.6",
         "dbt-semantic-interfaces>=0.7.3,<0.8",
         # Minor versions for these are expected to be backwards-compatible
-        "dbt-common>=1.9.0,<2.0",
+        "dbt-common>=1.11.0,<2.0",
         "dbt-adapters>=1.7.0,<2.0",
         # ----
         # Expect compatibility with all new versions of these packages, so lower bounds only.

schemas/dbt/manifest/v12.json

@@ -6540,6 +6540,12 @@
                       {
                         "type": "string"
                       },
+                      {
+                        "type": "array",
+                        "items": {
+                          "type": "string"
+                        }
+                      },
                       {
                         "type": "null"
                       }
@@ -16425,6 +16431,12 @@
                             {
                               "type": "string"
                             },
+                            {
+                              "type": "array",
+                              "items": {
+                                "type": "string"
+                              }
+                            },
                             {
                               "type": "null"
                             }