fix(memory): keep short pattern terms out of raw JSON metadata columns

Memory/src/storage/repositories.ts

@@ -980,22 +980,11 @@ export class MemoryRepository {
       ...filter,
       status: filter.status ?? ["activated", "resolving"]
     });
-    const clauses = normalized.map(() => {
-      const columns = [
-        "lower(memories.id) LIKE ? ESCAPE '\\'",
-        "lower(COALESCE(memories.memory_key, '')) LIKE ? ESCAPE '\\'",
-        "lower(memories.memory_value) LIKE ? ESCAPE '\\'",
-        "lower(memories.properties_json) LIKE ? ESCAPE '\\'",
-        "lower(memories.info_json) LIKE ? ESCAPE '\\'"
-      ];
-      if (includeTags) columns.push("lower(memories.tags_json) LIKE ? ESCAPE '\\'");
-      return `(${columns.join(" OR ")})`;
-    });
-    const params = normalized.flatMap((term) => {
+    const termColumns = normalized.map((term) => likeColumnsForTerm(term, includeTags));
+    const clauses = termColumns.map((columns) => `(${columns.join(" OR ")})`);
+    const params = normalized.flatMap((term, index) => {
       const pattern = `%${escapeLikePattern(term)}%`;
-      return includeTags
-        ? [pattern, pattern, pattern, pattern, pattern, pattern]
-        : [pattern, pattern, pattern, pattern, pattern];
+      return termColumns[index]!.map(() => pattern);
     });
     const rows = this.db
       .prepare(
@@ -3855,6 +3844,30 @@ function escapeLikePattern(value: string): string {
   return value.replace(/[\\%_]/g, (match) => `\\${match}`);
 }
 
+function likeColumnsForTerm(term: string, includeTags: boolean): string[] {
+  const columns = [
+    "lower(memories.id) LIKE ? ESCAPE '\\'",
+    "lower(COALESCE(memories.memory_key, '')) LIKE ? ESCAPE '\\'",
+    "lower(memories.memory_value) LIKE ? ESCAPE '\\'"
+  ];
+  // Short ASCII terms ("ts", "id", ...) are substrings of JSON keys present in
+  // every row's metadata blobs, so matching them there ranks unrelated recent
+  // memories above real hits. Longer terms and CJK bigrams cannot collide with
+  // JSON structure and keep their reach into metadata values.
+  if (!isShortAsciiTerm(term)) {
+    columns.push(
+      "lower(memories.properties_json) LIKE ? ESCAPE '\\'",
+      "lower(memories.info_json) LIKE ? ESCAPE '\\'"
+    );
+  }
+  if (includeTags) columns.push("lower(memories.tags_json) LIKE ? ESCAPE '\\'");
+  return columns;
+}
+
+function isShortAsciiTerm(term: string): boolean {
+  return /^[\x20-\x7e]{1,2}$/.test(term);
+}
+
 function normalizeAgentIdKey(value: string): string {
   return value.trim().toLowerCase().replace(/[\s-]+/gu, "_");
 }

Memory/tests/repository/memory-retrieval-index.test.ts

@@ -102,6 +102,54 @@ describe("memory retrieval indexes", () => {
     }
   });
 
+  it("keeps short ascii pattern terms out of raw JSON metadata columns", () => {
+    const root = mkdtempSync(join(tmpdir(), "mindock-memory-pattern-json-noise-"));
+    try {
+      const db = new MemoryDb({ path: join(root, "memory.sqlite") });
+      const repos = new Repositories(db.db);
+      repos.memories.insert({
+        ...traceMemory("trace-birthday-party"),
+        memoryValue: [
+          "Summary: planned a birthday party",
+          "User:",
+          "help me plan a birthday party",
+          "Agent:",
+          "balloons and cake are ready."
+        ].join("\n")
+      });
+      repos.memories.insert({
+        ...traceMemory("trace-build-error"),
+        memoryValue: [
+          "Summary: ts build error in web",
+          "User:",
+          "fix my ts build",
+          "Agent:",
+          "done, the build is green."
+        ].join("\n")
+      });
+
+      // Every trace row carries the JSON key "ts" inside properties_json, so a
+      // two-character query token must only match real content columns.
+      const hits = repos.memories.searchPatternIds(["ts"], { memoryLayer: "L1" }, 5)
+        .map((hit) => hit.id);
+      expect(hits).toContain("trace-build-error");
+      expect(hits).not.toContain("trace-birthday-party");
+
+      // CJK bigrams cannot collide with ASCII JSON keys and keep their reach
+      // into metadata values.
+      repos.memories.insert({
+        ...traceMemory("trace-cjk-metadata-only"),
+        memoryValue: "Summary: metadata-only cjk row"
+      });
+      expect(repos.memories.searchPatternIds(["科幻"], { memoryLayer: "L1" }, 5)
+        .map((hit) => hit.id)).toContain("trace-cjk-metadata-only");
+
+      db.close();
+    } finally {
+      rmSync(root, { recursive: true, force: true });
+    }
+  });
+
   it("filters memories by an inclusive start and exclusive end creation time", () => {
     const root = mkdtempSync(join(tmpdir(), "mindock-memory-time-filter-"));
     try {