diff --git a/mateclaw-server/src/main/java/vip/mate/memory/MemoryProperties.java b/mateclaw-server/src/main/java/vip/mate/memory/MemoryProperties.java
index cfac27e0..dec2aeef 100644
--- a/mateclaw-server/src/main/java/vip/mate/memory/MemoryProperties.java
+++ b/mateclaw-server/src/main/java/vip/mate/memory/MemoryProperties.java
@@ -138,5 +138,8 @@ public class MemoryProperties {
 
         /** Trust score half-life in days for time decay */
         private int trustHalfLifeDays = 60;
+
+        /** Enable UI Forget button on facts (Phase 3) */
+        private boolean forgetEnabled = false;
     }
 }
diff --git a/mateclaw-server/src/main/java/vip/mate/memory/fact/controller/FactController.java b/mateclaw-server/src/main/java/vip/mate/memory/fact/controller/FactController.java
index 30e86b88..fc143f49 100644
--- a/mateclaw-server/src/main/java/vip/mate/memory/fact/controller/FactController.java
+++ b/mateclaw-server/src/main/java/vip/mate/memory/fact/controller/FactController.java
@@ -64,8 +64,8 @@ public class FactController {
     public R<Void> forgetFact(@PathVariable Long agentId,
                                @PathVariable Long factId,
                                Authentication auth) {
-        if (!properties.getFact().isProjectionEnabled()) {
-            return R.fail("Fact projection is disabled");
+        if (!properties.getFact().isForgetEnabled()) {
+            return R.fail(410, "Forget is disabled");
         }
 
         FactEntity fact = factMapper.selectById(factId);
diff --git a/mateclaw-server/src/main/resources/application.yml b/mateclaw-server/src/main/resources/application.yml
index 10c74240..7d5275b0 100644
--- a/mateclaw-server/src/main/resources/application.yml
+++ b/mateclaw-server/src/main/resources/application.yml
@@ -218,3 +218,4 @@ mate:
       llm-extraction-enabled: false
       contradiction-check-enabled: false
       trust-half-life-days: 60
+      forget-enabled: false
diff --git a/mateclaw-server/src/main/resources/prompts/memory/contradiction-batch.txt b/mateclaw-server/src/main/resources/prompts/memory/contradiction-batch.txt
new file mode 100644
index 00000000..100ca947
--- /dev/null
+++ b/mateclaw-server/src/main/resources/prompts/memory/contradiction-batch.txt
@@ -0,0 +1,24 @@
+You are checking for contradictions between facts about the same entity.
+
+For each pair below, determine if they genuinely contradict each other.
+A contradiction means the two facts CANNOT both be true at the same time.
+
+Pairs to check:
+{pairs}
+
+For each pair, respond in JSON array format:
+[
+  {
+    "factA": <id>,
+    "factB": <id>,
+    "isContradiction": true|false,
+    "reason": "brief explanation"
+  }
+]
+
+Rules:
+- Temporal differences are NOT contradictions (e.g. "uses Oracle" and "migrating to PostgreSQL" can coexist)
+- Different scopes are NOT contradictions (e.g. "dev uses H2" and "prod uses MySQL")
+- Only flag genuine logical conflicts where both cannot be simultaneously true
+- Maximum 5 pairs per batch
+- Output ONLY the JSON array, no explanation outside it