diff --git a/.github/workflows/ruvector-postgres-ci.yml b/.github/workflows/ruvector-postgres-ci.yml
index aa26b538..619fbb91 100644
--- a/.github/workflows/ruvector-postgres-ci.yml
+++ b/.github/workflows/ruvector-postgres-ci.yml
@@ -179,9 +179,9 @@ jobs:
         run: cargo build --no-default-features --features pg${{ matrix.pg_version }} --release
         working-directory: crates/ruvector-postgres
 
-      - name: Run unit tests
-        run: cargo test --no-default-features --features pg${{ matrix.pg_version }} --lib -- --nocapture
-        working-directory: crates/ruvector-postgres
+      # Note: cargo test --lib is skipped because #[pg_test] tests require PostgreSQL runtime
+      # and cause linker errors (undefined symbols) when compiled outside pgrx test harness.
+      # All tests are run via cargo pgrx test instead.
 
       - name: Run pgrx tests
         run: cargo pgrx test pg${{ matrix.pg_version }} --no-default-features
diff --git a/crates/ruvector-postgres/src/attention/operators.rs b/crates/ruvector-postgres/src/attention/operators.rs
index 2b01078b..da3533b0 100644
--- a/crates/ruvector-postgres/src/attention/operators.rs
+++ b/crates/ruvector-postgres/src/attention/operators.rs
@@ -332,6 +332,11 @@ pub fn ruvector_attention_scores(
 mod tests {
     use super::*;
 
+    // Helper to convert Vec<Vec<f32>> to JsonB for tests
+    fn to_json(data: Vec<Vec<f32>>) -> JsonB {
+        JsonB(serde_json::json!(data))
+    }
+
     #[pg_test]
     fn test_ruvector_attention_score() {
         let query = vec![1.0, 0.0, 0.0];
@@ -362,8 +367,8 @@ mod tests {
     #[pg_test]
     fn test_ruvector_multi_head_attention() {
         let query = vec![1.0, 0.0, 0.0, 0.0];
-        let keys = vec![vec![1.0, 0.0, 0.0, 0.0], vec![0.0, 1.0, 0.0, 0.0]];
-        let values = vec![vec![1.0, 2.0], vec![3.0, 4.0]];
+        let keys = to_json(vec![vec![1.0, 0.0, 0.0, 0.0], vec![0.0, 1.0, 0.0, 0.0]]);
+        let values = to_json(vec![vec![1.0, 2.0], vec![3.0, 4.0]]);
 
         let result = ruvector_multi_head_attention(query, keys, values, 2);
 
@@ -375,8 +380,8 @@ mod tests {
     #[pg_test]
     fn test_ruvector_flash_attention() {
         let query = vec![1.0, 0.0, 0.0, 0.0];
-        let keys = vec![vec![1.0, 0.0, 0.0, 0.0]];
-        let values = vec![vec![5.0, 10.0]];
+        let keys = to_json(vec![vec![1.0, 0.0, 0.0, 0.0]]);
+        let values = to_json(vec![vec![5.0, 10.0]]);
 
         let result = ruvector_flash_attention(query, keys, values, 64);
 
@@ -388,11 +393,11 @@ mod tests {
     #[pg_test]
     fn test_ruvector_attention_scores() {
         let query = vec![1.0, 0.0, 0.0];
-        let keys = vec![
+        let keys = to_json(vec![
             vec![1.0, 0.0, 0.0],
             vec![0.0, 1.0, 0.0],
             vec![0.0, 0.0, 1.0],
-        ];
+        ]);
 
         let scores = ruvector_attention_scores(query, keys, "scaled_dot");
 
diff --git a/crates/ruvector-postgres/src/learning/operators.rs b/crates/ruvector-postgres/src/learning/operators.rs
index fbbe0f89..0e36bef2 100644
--- a/crates/ruvector-postgres/src/learning/operators.rs
+++ b/crates/ruvector-postgres/src/learning/operators.rs
@@ -433,7 +433,7 @@ mod tests {
 
     #[pg_test]
     fn test_auto_tune() {
-        ruvector_enable_learning("test_autotune", 1000).unwrap();
+        ruvector_enable_learning("test_autotune", None).unwrap();
 
         // Record some trajectories
         for i in 0..10 {
@@ -448,14 +448,14 @@ mod tests {
             .unwrap();
         }
 
-        let result = ruvector_auto_tune("test_autotune", "balanced", 1.0);
+        let result = ruvector_auto_tune("test_autotune", "balanced", None);
 
         assert!(result.is_ok());
     }
 
     #[pg_test]
     fn test_get_search_params() {
-        ruvector_enable_learning("test_search_params", 1000).unwrap();
+        ruvector_enable_learning("test_search_params", None).unwrap();
 
         // Record and extract patterns first
         for i in 0..20 {
@@ -494,7 +494,7 @@ mod tests {
             .unwrap();
         }
 
-        ruvector_extract_patterns("test_consolidate", Some(10)).unwrap();
+        ruvector_extract_patterns("test_consolidate", 10).unwrap();
 
         let result = ruvector_consolidate_patterns("test_consolidate", Some(0.95));
         assert!(result.is_ok());