diff --git a/modules/core/db/core.erm b/modules/core/db/core.erm
index db078515..29733dfa 100644
--- a/modules/core/db/core.erm
+++ b/modules/core/db/core.erm
@@ -11,8 +11,8 @@
 	</page_setting>
 	<category_index>0</category_index>
 	<zoom>1.0</zoom>
-	<x>0</x>
-	<y>0</y>
+	<x>2606</x>
+	<y>1945</y>
 	<default_color>
 		<r>128</r>
 		<g>128</g>
@@ -6270,19 +6270,6 @@
 						</column>
 					</columns>
 				</inidex>
-				<inidex>
-					<full_text>false</full_text>
-					<non_unique>true</non_unique>
-					<name>idx_sys_msg_inner_r_rc</name>
-					<type></type>
-					<description></description>
-					<columns>
-						<column>
-							<id>f291132581e824fea013624aa68208b946df9fe4</id>
-							<desc>false</desc>
-						</column>
-					</columns>
-				</inidex>
 				<inidex>
 					<full_text>false</full_text>
 					<non_unique>true</non_unique>
diff --git a/modules/core/db/db2/core.sql b/modules/core/db/db2/core.sql
index e0be5a99..d70e74f8 100644
--- a/modules/core/db/db2/core.sql
+++ b/modules/core/db/db2/core.sql
@@ -860,7 +860,6 @@ CREATE INDEX idx_sys_msg_inner_cl ON js_sys_msg_inner (content_level);
 CREATE INDEX idx_sys_msg_inner_sc ON js_sys_msg_inner (send_user_code);
 CREATE INDEX idx_sys_msg_inner_sd ON js_sys_msg_inner (send_date);
 CREATE INDEX idx_sys_msg_inner_r_mi ON js_sys_msg_inner_record (msg_inner_id);
-CREATE INDEX idx_sys_msg_inner_r_rc ON js_sys_msg_inner_record (receive_user_code);
 CREATE INDEX idx_sys_msg_inner_r_ruc ON js_sys_msg_inner_record (receive_user_code);
 CREATE INDEX idx_sys_msg_inner_r_status ON js_sys_msg_inner_record (read_status);
 CREATE INDEX idx_sys_msg_inner_r_star ON js_sys_msg_inner_record (is_star);
diff --git a/modules/core/db/mssql/core.sql b/modules/core/db/mssql/core.sql
index e3a826be..213e0e98 100644
--- a/modules/core/db/mssql/core.sql
+++ b/modules/core/db/mssql/core.sql
@@ -860,7 +860,6 @@ CREATE INDEX [idx_sys_msg_inner_cl] ON [js_sys_msg_inner] ([content_level]);
 CREATE INDEX [idx_sys_msg_inner_sc] ON [js_sys_msg_inner] ([send_user_code]);
 CREATE INDEX [idx_sys_msg_inner_sd] ON [js_sys_msg_inner] ([send_date]);
 CREATE INDEX [idx_sys_msg_inner_r_mi] ON [js_sys_msg_inner_record] ([msg_inner_id]);
-CREATE INDEX [idx_sys_msg_inner_r_rc] ON [js_sys_msg_inner_record] ([receive_user_code]);
 CREATE INDEX [idx_sys_msg_inner_r_ruc] ON [js_sys_msg_inner_record] ([receive_user_code]);
 CREATE INDEX [idx_sys_msg_inner_r_status] ON [js_sys_msg_inner_record] ([read_status]);
 CREATE INDEX [idx_sys_msg_inner_r_star] ON [js_sys_msg_inner_record] ([is_star]);
diff --git a/modules/core/db/mysql/core.sql b/modules/core/db/mysql/core.sql
index c4210a56..3a70049c 100644
--- a/modules/core/db/mysql/core.sql
+++ b/modules/core/db/mysql/core.sql
@@ -862,7 +862,6 @@ CREATE INDEX idx_sys_msg_inner_cl ON js_sys_msg_inner (content_level ASC);
 CREATE INDEX idx_sys_msg_inner_sc ON js_sys_msg_inner (send_user_code ASC);
 CREATE INDEX idx_sys_msg_inner_sd ON js_sys_msg_inner (send_date ASC);
 CREATE INDEX idx_sys_msg_inner_r_mi ON js_sys_msg_inner_record (msg_inner_id ASC);
-CREATE INDEX idx_sys_msg_inner_r_rc ON js_sys_msg_inner_record (receive_user_code ASC);
 CREATE INDEX idx_sys_msg_inner_r_ruc ON js_sys_msg_inner_record (receive_user_code ASC);
 CREATE INDEX idx_sys_msg_inner_r_status ON js_sys_msg_inner_record (read_status ASC);
 CREATE INDEX idx_sys_msg_inner_r_star ON js_sys_msg_inner_record (is_star ASC);
diff --git a/modules/core/db/oracle/core.sql b/modules/core/db/oracle/core.sql
index 3026384e..0caed7d0 100644
--- a/modules/core/db/oracle/core.sql
+++ b/modules/core/db/oracle/core.sql
@@ -860,7 +860,6 @@ CREATE INDEX idx_sys_msg_inner_cl ON js_sys_msg_inner (content_level);
 CREATE INDEX idx_sys_msg_inner_sc ON js_sys_msg_inner (send_user_code);
 CREATE INDEX idx_sys_msg_inner_sd ON js_sys_msg_inner (send_date);
 CREATE INDEX idx_sys_msg_inner_r_mi ON js_sys_msg_inner_record (msg_inner_id);
-CREATE INDEX idx_sys_msg_inner_r_rc ON js_sys_msg_inner_record (receive_user_code);
 CREATE INDEX idx_sys_msg_inner_r_ruc ON js_sys_msg_inner_record (receive_user_code);
 CREATE INDEX idx_sys_msg_inner_r_status ON js_sys_msg_inner_record (read_status);
 CREATE INDEX idx_sys_msg_inner_r_star ON js_sys_msg_inner_record (is_star);
diff --git a/modules/core/db/postgresql/core.sql b/modules/core/db/postgresql/core.sql
index 05304ede..b0cf5453 100644
--- a/modules/core/db/postgresql/core.sql
+++ b/modules/core/db/postgresql/core.sql
@@ -860,7 +860,6 @@ CREATE INDEX idx_sys_msg_inner_cl ON js_sys_msg_inner (content_level);
 CREATE INDEX idx_sys_msg_inner_sc ON js_sys_msg_inner (send_user_code);
 CREATE INDEX idx_sys_msg_inner_sd ON js_sys_msg_inner (send_date);
 CREATE INDEX idx_sys_msg_inner_r_mi ON js_sys_msg_inner_record (msg_inner_id);
-CREATE INDEX idx_sys_msg_inner_r_rc ON js_sys_msg_inner_record (receive_user_code);
 CREATE INDEX idx_sys_msg_inner_r_ruc ON js_sys_msg_inner_record (receive_user_code);
 CREATE INDEX idx_sys_msg_inner_r_status ON js_sys_msg_inner_record (read_status);
 CREATE INDEX idx_sys_msg_inner_r_star ON js_sys_msg_inner_record (is_star);
diff --git a/web/db/mssql/core.sql b/web/db/mssql/core.sql
index e3a826be..213e0e98 100644
--- a/web/db/mssql/core.sql
+++ b/web/db/mssql/core.sql
@@ -860,7 +860,6 @@ CREATE INDEX [idx_sys_msg_inner_cl] ON [js_sys_msg_inner] ([content_level]);
 CREATE INDEX [idx_sys_msg_inner_sc] ON [js_sys_msg_inner] ([send_user_code]);
 CREATE INDEX [idx_sys_msg_inner_sd] ON [js_sys_msg_inner] ([send_date]);
 CREATE INDEX [idx_sys_msg_inner_r_mi] ON [js_sys_msg_inner_record] ([msg_inner_id]);
-CREATE INDEX [idx_sys_msg_inner_r_rc] ON [js_sys_msg_inner_record] ([receive_user_code]);
 CREATE INDEX [idx_sys_msg_inner_r_ruc] ON [js_sys_msg_inner_record] ([receive_user_code]);
 CREATE INDEX [idx_sys_msg_inner_r_status] ON [js_sys_msg_inner_record] ([read_status]);
 CREATE INDEX [idx_sys_msg_inner_r_star] ON [js_sys_msg_inner_record] ([is_star]);
diff --git a/web/db/mysql/core.sql b/web/db/mysql/core.sql
index c4210a56..3a70049c 100644
--- a/web/db/mysql/core.sql
+++ b/web/db/mysql/core.sql
@@ -862,7 +862,6 @@ CREATE INDEX idx_sys_msg_inner_cl ON js_sys_msg_inner (content_level ASC);
 CREATE INDEX idx_sys_msg_inner_sc ON js_sys_msg_inner (send_user_code ASC);
 CREATE INDEX idx_sys_msg_inner_sd ON js_sys_msg_inner (send_date ASC);
 CREATE INDEX idx_sys_msg_inner_r_mi ON js_sys_msg_inner_record (msg_inner_id ASC);
-CREATE INDEX idx_sys_msg_inner_r_rc ON js_sys_msg_inner_record (receive_user_code ASC);
 CREATE INDEX idx_sys_msg_inner_r_ruc ON js_sys_msg_inner_record (receive_user_code ASC);
 CREATE INDEX idx_sys_msg_inner_r_status ON js_sys_msg_inner_record (read_status ASC);
 CREATE INDEX idx_sys_msg_inner_r_star ON js_sys_msg_inner_record (is_star ASC);
diff --git a/web/db/oracle/core.sql b/web/db/oracle/core.sql
index 3026384e..0caed7d0 100644
--- a/web/db/oracle/core.sql
+++ b/web/db/oracle/core.sql
@@ -860,7 +860,6 @@ CREATE INDEX idx_sys_msg_inner_cl ON js_sys_msg_inner (content_level);
 CREATE INDEX idx_sys_msg_inner_sc ON js_sys_msg_inner (send_user_code);
 CREATE INDEX idx_sys_msg_inner_sd ON js_sys_msg_inner (send_date);
 CREATE INDEX idx_sys_msg_inner_r_mi ON js_sys_msg_inner_record (msg_inner_id);
-CREATE INDEX idx_sys_msg_inner_r_rc ON js_sys_msg_inner_record (receive_user_code);
 CREATE INDEX idx_sys_msg_inner_r_ruc ON js_sys_msg_inner_record (receive_user_code);
 CREATE INDEX idx_sys_msg_inner_r_status ON js_sys_msg_inner_record (read_status);
 CREATE INDEX idx_sys_msg_inner_r_star ON js_sys_msg_inner_record (is_star);
diff --git a/web/db/postgresql/core.sql b/web/db/postgresql/core.sql
index 05304ede..b0cf5453 100644
--- a/web/db/postgresql/core.sql
+++ b/web/db/postgresql/core.sql
@@ -860,7 +860,6 @@ CREATE INDEX idx_sys_msg_inner_cl ON js_sys_msg_inner (content_level);
 CREATE INDEX idx_sys_msg_inner_sc ON js_sys_msg_inner (send_user_code);
 CREATE INDEX idx_sys_msg_inner_sd ON js_sys_msg_inner (send_date);
 CREATE INDEX idx_sys_msg_inner_r_mi ON js_sys_msg_inner_record (msg_inner_id);
-CREATE INDEX idx_sys_msg_inner_r_rc ON js_sys_msg_inner_record (receive_user_code);
 CREATE INDEX idx_sys_msg_inner_r_ruc ON js_sys_msg_inner_record (receive_user_code);
 CREATE INDEX idx_sys_msg_inner_r_status ON js_sys_msg_inner_record (read_status);
 CREATE INDEX idx_sys_msg_inner_r_star ON js_sys_msg_inner_record (is_star);