multiple enhancements and fix

added columns for OSS file key and etag in task table
added soft delete feature for student, subject, term and exam level table
added drag & drop for task calendar
added calendar color specification for each subject

db/tables/stdt_subjects.sql

@@ -9,6 +9,8 @@
 	"LAST_UPDATED_BY" VARCHAR2(150) NOT NULL ENABLE, 
 	"LAST_UPDATE_DATE" TIMESTAMP (6) NOT NULL ENABLE, 
 	"TENANT_ID" NUMBER, 
+	"CALENDAR_COLOR" VARCHAR2(150), 
+	"DELETED_FLAG" VARCHAR2(1), 
 	 CONSTRAINT "STDT_SUBJECTS_PK" PRIMARY KEY ("SUBJECT_ID")
   USING INDEX  ENABLE
    ) ;

db/tables/stdt_tasks.sql

@@ -29,6 +29,16 @@
 	"IMAGE_05_MIME_TYPE" VARCHAR2(150), 
 	"IMAGE_05_FILE_NAME" VARCHAR2(240), 
 	"TENANT_ID" NUMBER, 
+	"IMAGE_01_KEY" VARCHAR2(4000), 
+	"IMAGE_01_ETAG" VARCHAR2(4000), 
+	"IMAGE_02_KEY" VARCHAR2(4000), 
+	"IMAGE_02_ETAG" VARCHAR2(4000), 
+	"IMAGE_03_KEY" VARCHAR2(4000), 
+	"IMAGE_03_ETAG" VARCHAR2(4000), 
+	"IMAGE_04_KEY" VARCHAR2(4000), 
+	"IMAGE_04_ETAG" VARCHAR2(4000), 
+	"IMAGE_05_KEY" VARCHAR2(4000), 
+	"IMAGE_05_ETAG" VARCHAR2(4000), 
 	 CONSTRAINT "STDT_TASKS_PK" PRIMARY KEY ("TASK_ID")
   USING INDEX  ENABLE
    ) ;

db/tables/stdt_terms.sql

@@ -10,6 +10,7 @@
 	"LAST_UPDATED_BY" VARCHAR2(150) NOT NULL ENABLE, 
 	"LAST_UPDATE_DATE" TIMESTAMP (6) NOT NULL ENABLE, 
 	"TENANT_ID" NUMBER, 
+	"DELETED_FLAG" VARCHAR2(1), 
 	 CONSTRAINT "STDT_TERMS_PK" PRIMARY KEY ("TERM_ID")
   USING INDEX  ENABLE
    ) ;