diff --git a/src/main/java/com/swyp/picke/global/common/exception/ErrorCode.java b/src/main/java/com/swyp/picke/global/common/exception/ErrorCode.java
index 6ddfff17..b68b2829 100644
--- a/src/main/java/com/swyp/picke/global/common/exception/ErrorCode.java
+++ b/src/main/java/com/swyp/picke/global/common/exception/ErrorCode.java
@@ -12,6 +12,7 @@ public enum ErrorCode {
     INTERNAL_SERVER_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "COMMON_500", "서버 오류가 발생했습니다. 관리자에게 문의해 주세요."),
     BAD_REQUEST(HttpStatus.BAD_REQUEST, "COMMON_400", "잘못된 요청입니다."),
     COMMON_INVALID_PARAMETER(HttpStatus.BAD_REQUEST, "COMMON_400", "요청 파라미터가 잘못되었습니다."),
+    COMMON_CONFLICT(HttpStatus.CONFLICT, "COMMON_409", "요청이 현재 데이터 상태와 충돌합니다."),
 
     // File & S3
     FILE_UPLOAD_FAILED(HttpStatus.INTERNAL_SERVER_ERROR, "FILE_500", "파일 업로드 중 오류가 발생했습니다."),
@@ -89,7 +90,7 @@ public enum ErrorCode {
     PERSPECTIVE_FORBIDDEN(HttpStatus.FORBIDDEN, "PERSPECTIVE_403", "본인 관점만 수정/삭제할 수 있습니다."),
     PERSPECTIVE_POST_VOTE_REQUIRED(HttpStatus.CONFLICT, "PERSPECTIVE_VOTE_409", "사후 투표가 완료되지 않았습니다."),
     PERSPECTIVE_MODERATION_NOT_FAILED(HttpStatus.BAD_REQUEST, "PERSPECTIVE_400", "검수 실패 상태의 관점이 아닙니다."),
-    PERSPECTIVE_CONTENT_TOO_LONG(HttpStatus.BAD_REQUEST, "PERSPECTIVE_400_LEN", "관점 내용은 200자를 초과할 수 없습니다."),
+    PERSPECTIVE_CONTENT_TOO_LONG(HttpStatus.BAD_REQUEST, "PERSPECTIVE_400_LEN", "의견·댓글은 200자를 초과할 수 없습니다."),
 
     // Comment
     COMMENT_NOT_FOUND(HttpStatus.NOT_FOUND, "COMMENT_NOT_FOUND", "존재하지 않는 댓글입니다."),
@@ -138,6 +139,11 @@ public enum ErrorCode {
     TICKET_ALREADY_ACTIVE(HttpStatus.CONFLICT, "TICKET_409_ACTIVE", "이미 사용 중인 이용권이 있습니다. 만료 후 등록할 수 있습니다."),
     TICKET_NOT_FOUND(HttpStatus.NOT_FOUND, "TICKET_404", "등록된 이용권이 없습니다."),
     TICKET_STATE_CONFLICT(HttpStatus.CONFLICT, "TICKET_409_STATE", "현재 상태에서는 처리할 수 없는 이용권입니다."),
+    TICKET_CODE_NOT_RETRIEVABLE(HttpStatus.CONFLICT, "TICKET_409_CODE_NOT_RETRIEVABLE", "이용권 코드 보관 기능 도입 전에 발급된 코드라 다시 조회할 수 없습니다. 미등록 코드만 재발급할 수 있습니다."),
+    TICKET_CODE_STORAGE_UNAVAILABLE(HttpStatus.SERVICE_UNAVAILABLE, "TICKET_503_CODE_STORAGE", "이용권 코드 암호화 설정이 없거나 올바르지 않습니다."),
+    FUNDING_DUPLICATE_SUPPORTER(HttpStatus.CONFLICT, "FUNDING_409_DUPLICATE", "이미 등록된 캠페인 후원번호와 리워드입니다."),
+    TUMBLBUG_PLAN_CONFLICT(HttpStatus.CONFLICT, "FUNDING_409_PLAN", "캠페인에 저장된 텀블벅 요금제와 요청 요금제가 다릅니다."),
+    TUMBLBUG_PLAN_FEATURE_UNAVAILABLE(HttpStatus.CONFLICT, "FUNDING_409_PLAN_FEATURE", "이 요금제에서는 텀블벅 디지털 선물 XLSX 기능을 사용할 수 없습니다."),
 
     // Funding (어드민 펀딩 명단·발급)
     FUNDING_ORDER_NOT_FOUND(HttpStatus.NOT_FOUND, "FUNDING_404_ORDER", "존재하지 않는 펀딩 주문입니다."),
diff --git a/src/main/java/com/swyp/picke/global/common/exception/GlobalExceptionHandler.java b/src/main/java/com/swyp/picke/global/common/exception/GlobalExceptionHandler.java
index b457b923..9ff5f203 100644
--- a/src/main/java/com/swyp/picke/global/common/exception/GlobalExceptionHandler.java
+++ b/src/main/java/com/swyp/picke/global/common/exception/GlobalExceptionHandler.java
@@ -14,6 +14,7 @@
 import org.springframework.web.bind.annotation.RestControllerAdvice;
 import org.springframework.web.method.annotation.MethodArgumentTypeMismatchException;
 import org.springframework.web.multipart.MaxUploadSizeExceededException;
+import java.sql.SQLException;
 
 @Slf4j
 @RestControllerAdvice
@@ -89,22 +90,39 @@ public ResponseEntity<ApiResponse<Void>> handleAccessDeniedException(Exception e
     @ExceptionHandler(DataIntegrityViolationException.class)
     public ResponseEntity<ApiResponse<Void>> handleDataIntegrityViolation(DataIntegrityViolationException e) {
         String detail = String.valueOf(e.getMostSpecificCause().getMessage());
-        ErrorCode code = detail.contains("uk_tumblbug_supporter_line")
-                || detail.contains("uk_tumblbug_funding_order")
-                || detail.contains("uk_funding_orders_order_id")
+        String normalizedDetail = detail.toLowerCase(java.util.Locale.ROOT);
+        String sqlState = findSqlState(e);
+        ErrorCode code = normalizedDetail.contains("uk_tumblbug_supporter_line")
+                || normalizedDetail.contains("uk_tumblbug_funding_order")
+                || normalizedDetail.contains("uk_funding_orders_order_id")
                         ? ErrorCode.FUNDING_TUMBLBUG_IMPORT_DUPLICATE
-                        : detail.contains("uk_funding_campaign_platform_external")
+                        : normalizedDetail.contains("uk_funding_campaign_platform_external")
                                 ? ErrorCode.FUNDING_CAMPAIGN_DUPLICATE
-                                : ErrorCode.INTERNAL_SERVER_ERROR;
-        if (code == ErrorCode.INTERNAL_SERVER_ERROR) {
-            log.error("Data integrity constraint violation", e);
-        } else {
-            log.warn("Data integrity constraint rejected a request: {}", detail);
-        }
+                                : isBadRequestConstraint(sqlState)
+                                        ? ErrorCode.COMMON_INVALID_PARAMETER
+                                        : ErrorCode.COMMON_CONFLICT;
+        log.warn("Data integrity constraint rejected a request: sqlState={}", sqlState);
         return ResponseEntity.status(code.getHttpStatus())
                 .body(ApiResponse.onFailure(code.getHttpStatus().value(), code.getCode(), code.getMessage()));
     }
 
+    private String findSqlState(Throwable exception) {
+        Throwable current = exception;
+        while (current != null) {
+            if (current instanceof SQLException sqlException && sqlException.getSQLState() != null) {
+                return sqlException.getSQLState();
+            }
+            current = current.getCause();
+        }
+        return null;
+    }
+
+    private boolean isBadRequestConstraint(String sqlState) {
+        return "23502".equals(sqlState) // not-null
+                || "23514".equals(sqlState) // check
+                || "22001".equals(sqlState); // value too long
+    }
+
     @ExceptionHandler(Exception.class)
     public ResponseEntity<ApiResponse<Void>> handleAllException(Exception e) {
         log.error("Internal Server Error: ", e);
diff --git a/src/main/java/com/swyp/picke/global/common/util/CursorParser.java b/src/main/java/com/swyp/picke/global/common/util/CursorParser.java
new file mode 100644
index 00000000..041b4667
--- /dev/null
+++ b/src/main/java/com/swyp/picke/global/common/util/CursorParser.java
@@ -0,0 +1,24 @@
+package com.swyp.picke.global.common.util;
+
+import com.swyp.picke.global.common.exception.CustomException;
+import com.swyp.picke.global.common.exception.ErrorCode;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeParseException;
+
+/** Parses cursors emitted by APIs as ISO-8601 local timestamps. */
+public final class CursorParser {
+
+    private CursorParser() {
+    }
+
+    public static LocalDateTime parseDateTime(String cursor) {
+        if (cursor == null) {
+            return null;
+        }
+        try {
+            return LocalDateTime.parse(cursor);
+        } catch (DateTimeParseException e) {
+            throw new CustomException(ErrorCode.COMMON_INVALID_PARAMETER);
+        }
+    }
+}