diff --git a/models/silver/_observability/silver_observability.yml b/models/silver/_observability/silver_observability.yml
index 4d29807..9386e32 100644
--- a/models/silver/_observability/silver_observability.yml
+++ b/models/silver/_observability/silver_observability.yml
@@ -21,37 +21,37 @@ models:
         description: The lowest block id in the test
         tests:
           - not_null:
-              tag: ['test_quality']
+              tags: ['test_quality']
       - name: MAX_BLOCK
         data_type: NUMBER
         description: The highest block id in the test
         tests:
           - not_null:
-              tag: ['test_quality']
+              tags: ['test_quality']
       - name: MIN_BLOCK_TIMESTAMP
         data_type: TIMESTAMP_NTZ
         description: The lowest block timestamp in the test
         tests:
           - not_null:
-              tag: ['test_quality']
+              tags: ['test_quality']
       - name: MAX_BLOCK_TIMESTAMP
         data_type: TIMESTAMP_NTZ
         description: The highest block timestamp in the test
         tests:
           - not_null:
-              tag: ['test_quality']
+              tags: ['test_quality']
       - name: BLOCKS_TESTED
         data_type: NUMBER
         description: Count of blocks in the test
         tests:
           - not_null:
-              tag: ['test_quality']
+              tags: ['test_quality']
       - name: BLOCKS_IMPACTED_COUNT
         data_type: NUMBER
         description: Count of block gaps in the test
         tests: 
           - not_null:
-              tag: ['test_quality']
+              tags: ['test_quality']
       - name: BLOCKS_IMPACTED_ARRAY
         data_type: ARRAY
         description: Array of affected blocks
@@ -60,9 +60,11 @@ models:
         description: When the test was run
         tests:
           - not_null:
-              tag: ['test_quality']
+              tags: ['test_quality']
           - unique:
-              tag: ['test_quality']
+              tags: ['test_quality']
+      - name: MODIFIED_TIMESTAMP
+        data_type: TIMESTAMP_NTZ
 
   - name: silver_observability__transactions_completeness
     description: Records of all blocks with missing transactions with a timestamp the test was run
@@ -82,37 +84,37 @@ models:
         description: The lowest block id in the test
         tests:
           - not_null:
-              tag: ['test_quality']
+              tags: ['test_quality']
       - name: MAX_BLOCK
         data_type: NUMBER
         description: The highest block id in the test
         tests:
           - not_null:
-              tag: ['test_quality']
+              tags: ['test_quality']
       - name: MIN_BLOCK_TIMESTAMP
         data_type: TIMESTAMP_NTZ
         description: The lowest block timestamp in the test
         tests:
           - not_null:
-              tag: ['test_quality']
+              tags: ['test_quality']
       - name: MAX_BLOCK_TIMESTAMP
         data_type: TIMESTAMP_NTZ
         description: The highest block timestamp in the test
         tests:
           - not_null:
-              tag: ['test_quality']
+              tags: ['test_quality']
       - name: BLOCKS_TESTED
         data_type: NUMBER
         description: Count of blocks in the test
         tests:
           - not_null:
-              tag: ['test_quality']
+              tags: ['test_quality']
       - name: BLOCKS_IMPACTED_COUNT
         data_type: NUMBER
         description: Count of block gaps in the test
         tests: 
           - not_null:
-              tag: ['test_quality']
+              tags: ['test_quality']
       - name: BLOCKS_IMPACTED_ARRAY
         data_type: ARRAY
         description: Array of affected blocks
@@ -121,6 +123,8 @@ models:
         description: When the test was run
         tests:
           - not_null:
-              tag: ['test_quality']
+              tags: ['test_quality']
           - unique:
-              tag: ['test_quality']
+              tags: ['test_quality']
+      - name: MODIFIED_TIMESTAMP
+        data_type: TIMESTAMP_NTZ
diff --git a/models/silver/_observability/silver_observability__blocks_completeness.sql b/models/silver/_observability/silver_observability__blocks_completeness.sql
index f3d669b..c3ae205 100644
--- a/models/silver/_observability/silver_observability__blocks_completeness.sql
+++ b/models/silver/_observability/silver_observability__blocks_completeness.sql
@@ -152,7 +152,8 @@ SELECT
         ORDER BY
             A.block_number
     ) AS blocks_impacted_array,
-    SYSDATE() AS test_timestamp
+    SYSDATE() AS test_timestamp,
+    SYSDATE() AS modified_timestamp
 FROM
     block_gen A
     LEFT JOIN blocks b
diff --git a/models/silver/_observability/silver_observability__transactions_completeness.sql b/models/silver/_observability/silver_observability__transactions_completeness.sql
index 5e206ef..bd19d2f 100644
--- a/models/silver/_observability/silver_observability__transactions_completeness.sql
+++ b/models/silver/_observability/silver_observability__transactions_completeness.sql
@@ -134,7 +134,8 @@ SELECT
     blocks_tested,
     blocks_impacted_count,
     blocks_impacted_array,
-    SYSDATE() AS test_timestamp
+    SYSDATE() AS test_timestamp,
+    SYSDATE() AS modified_timestamp
 FROM
     summary_stats
     JOIN impacted_blocks