diff --git a/PRISMA_TO_RAW_QUERY_MIGRATION_PLAN.md b/PRISMA_TO_RAW_QUERY_MIGRATION_PLAN.md
index 056b62c3..645420ae 100644
--- a/PRISMA_TO_RAW_QUERY_MIGRATION_PLAN.md
+++ b/PRISMA_TO_RAW_QUERY_MIGRATION_PLAN.md
@@ -131,7 +131,7 @@ backend-node/ (루트)
 - `layoutService.ts` (0개) - ✅ **전환 완료** (Phase 3.7)
 - `dbTypeCategoryService.ts` (0개) - ✅ **전환 완료** (Phase 3.8)
 - `templateStandardService.ts` (0개) - ✅ **전환 완료** (Phase 3.9)
-- `eventTriggerService.ts` (6개) - JSON 검색 쿼리
+- `eventTriggerService.ts` (0개) - ✅ **전환 완료** (Phase 3.10)
 
 #### 🟡 **중간 (단순 CRUD) - 3순위**
 
@@ -1214,6 +1214,16 @@ describe("Performance Benchmarks", () => {
   - [x] DISTINCT 쿼리 (카테고리 목록)
   - [x] TypeScript 컴파일 성공
   - [x] Prisma import 완전 제거
+- [x] **EventTriggerService 전환 (6개)** ✅ **완료** (Phase 3.10)
+  - [x] 6개 Prisma 호출 전환 완료 (이벤트 트리거, JSON 검색)
+  - [x] JSON 필드 검색 ($queryRaw → query, JSONB 연산자)
+  - [x] 동적 INSERT 쿼리 (PostgreSQL 플레이스홀더)
+  - [x] 동적 UPDATE 쿼리 (WHERE 조건 + 플레이스홀더)
+  - [x] 동적 DELETE 쿼리 (WHERE 조건)
+  - [x] UPSERT 쿼리 (ON CONFLICT)
+  - [x] 다이어그램 조회 (findUnique → queryOne)
+  - [x] TypeScript 컴파일 성공
+  - [x] Prisma import 완전 제거
 - [ ] 배치 관련 서비스 전환 (26개) ⭐ 대규모 신규 발견
   - [ ] BatchExternalDbService (8개)
   - [ ] BatchExecutionLogService (7개), BatchManagementService (5개)
diff --git a/backend-node/src/services/eventTriggerService.ts b/backend-node/src/services/eventTriggerService.ts
index 758455c6..f8258a6b 100644
--- a/backend-node/src/services/eventTriggerService.ts
+++ b/backend-node/src/services/eventTriggerService.ts
@@ -1,8 +1,6 @@
-import { PrismaClient } from "@prisma/client";
+import { query, queryOne } from "../database/db";
 import { logger } from "../utils/logger";
 
-const prisma = new PrismaClient();
-
 // 조건 노드 타입 정의
 interface ConditionNode {
   id: string; // 고유 ID
@@ -92,15 +90,16 @@ export class EventTriggerService {
 
     try {
       // 🔥 수정: Raw SQL을 사용하여 JSON 배열 검색
-      const diagrams = (await prisma.$queryRaw`
-        SELECT * FROM dataflow_diagrams 
-        WHERE company_code = ${companyCode}
-        AND (
-          category::text = '"data-save"' OR 
-          category::jsonb ? 'data-save' OR
-          category::jsonb @> '["data-save"]'
-        )
-      `) as any[];
+      const diagrams = await query<any>(
+        `SELECT * FROM dataflow_diagrams 
+         WHERE company_code = $1
+         AND (
+           category::text = '"data-save"' OR 
+           category::jsonb ? 'data-save' OR
+           category::jsonb @> '["data-save"]'
+         )`,
+        [companyCode]
+      );
 
       // 각 관계도에서 해당 테이블을 소스로 하는 데이터 저장 관계들 필터링
       const matchingDiagrams = diagrams.filter((diagram) => {
@@ -537,13 +536,14 @@ export class EventTriggerService {
     data: Record<string, any>
   ): Promise<void> {
     // 동적 테이블 INSERT 실행
-    const sql = `INSERT INTO ${tableName} (${Object.keys(data).join(", ")}) VALUES (${Object.keys(
-      data
-    )
-      .map(() => "?")
-      .join(", ")})`;
+    // PostgreSQL 파라미터 플레이스홀더로 변경 (? → $1, $2, ...)
+    const values = Object.values(data);
+    const placeholders = values.map((_, i) => `$${i + 1}`).join(", ");
+    const sql = `INSERT INTO ${tableName} (${Object.keys(data).join(
+      ", "
+    )}) VALUES (${placeholders})`;
 
-    await prisma.$executeRawUnsafe(sql, ...Object.values(data));
+    await query(sql, values);
     logger.info(`Inserted data into ${tableName}:`, data);
   }
 
@@ -563,14 +563,15 @@ export class EventTriggerService {
     }
 
     // 동적 테이블 UPDATE 실행
+    const values = Object.values(data);
     const setClause = Object.keys(data)
-      .map((key) => `${key} = ?`)
+      .map((key, i) => `${key} = $${i + 1}`)
       .join(", ");
     const whereClause = this.buildWhereClause(conditions);
 
     const sql = `UPDATE ${tableName} SET ${setClause} WHERE ${whereClause}`;
 
-    await prisma.$executeRawUnsafe(sql, ...Object.values(data));
+    await query(sql, values);
     logger.info(`Updated data in ${tableName}:`, data);
   }
 
@@ -593,7 +594,7 @@ export class EventTriggerService {
     const whereClause = this.buildWhereClause(conditions);
     const sql = `DELETE FROM ${tableName} WHERE ${whereClause}`;
 
-    await prisma.$executeRawUnsafe(sql);
+    await query(sql, []);
     logger.info(`Deleted data from ${tableName} with conditions`);
   }
 
@@ -608,15 +609,16 @@ export class EventTriggerService {
     const columns = Object.keys(data);
     const values = Object.values(data);
     const conflictColumns = ["id", "company_code"]; // 기본 충돌 컬럼
+    const placeholders = values.map((_, i) => `$${i + 1}`).join(", ");
 
     const sql = `
       INSERT INTO ${tableName} (${columns.join(", ")})
-      VALUES (${columns.map(() => "?").join(", ")})
+      VALUES (${placeholders})
       ON CONFLICT (${conflictColumns.join(", ")})
       DO UPDATE SET ${columns.map((col) => `${col} = EXCLUDED.${col}`).join(", ")}
     `;
 
-    await prisma.$executeRawUnsafe(sql, ...values);
+    await query(sql, values);
     logger.info(`Upserted data into ${tableName}:`, data);
   }
 
@@ -678,9 +680,10 @@ export class EventTriggerService {
     companyCode: string
   ): Promise<{ conditionMet: boolean; result?: ExecutionResult }> {
     try {
-      const diagram = await prisma.dataflow_diagrams.findUnique({
-        where: { diagram_id: diagramId },
-      });
+      const diagram = await queryOne<any>(
+        `SELECT * FROM dataflow_diagrams WHERE diagram_id = $1`,
+        [diagramId]
+      );
 
       if (!diagram) {
         throw new Error(`Diagram ${diagramId} not found`);