fix(database): 🐛 remove storage of students in Unit class

backend/src/main/java/org/acme/domain/Unit.java

@@ -10,6 +10,7 @@
 import jakarta.persistence.JoinColumn;
 import jakarta.persistence.ManyToMany;
 import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Transient;
 
 import java.time.DayOfWeek;
 import java.time.Duration;
@@ -45,10 +46,13 @@ public class Unit extends PanacheEntity {
     public LocalTime startTime;
 
     // TODO: change unit to be the owner, rather than the student being owner
+    @Transient
     @JsonIgnoreProperties("units")
     @ManyToMany(mappedBy = "units", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
     public List<Student> students;
 
+    public int studentSize;
+
     /*
      * currently each unit only has 1 'slot' on the timetable, so it can only
      * be associated with one room, but in the final product, we would most 
@@ -90,6 +94,7 @@ public Unit(int unitID, String name, String course, Duration duration, List<Stud
         this.course = course;
         this.duration = duration;
         this.students = students;
+        this.studentSize = this.students.size();
         this.setStudentsUnits();
     }
 
@@ -109,6 +114,7 @@ public Unit(int unitID, String name, String course, Duration duration, List<Stud
         this.course = course;
         this.duration = duration;
         this.students = students;
+        this.studentSize = this.students.size();
         this.wantsLab = wantsLab;
         this.setStudentsUnits();
     }
@@ -132,6 +138,7 @@ public Unit(int unitID, String name, String course, DayOfWeek dayOfWeek, LocalTi
         this.startTime = startTime;
         this.duration = duration;
         this.students = students;
+        this.studentSize = this.students.size();
         this.wantsLab = wantsLab;
         this.room = room;
     }
@@ -206,7 +213,7 @@ public void setStudentsUnits() {
      * @return An int representing the number of students.
      */
     public int getStudentSize() {
-        return students.size();
+        return this.studentSize;
     }
 
     public Room getRoom() {

backend/src/main/resources/application.properties

@@ -17,15 +17,58 @@ quarkus.datasource.jdbc.url = ${QUARKUS_DATASOURCE_JDBC_URL}
 # drop and create the database at startup (use `update` to only update the schema)
 quarkus.hibernate-orm.database.generation = create-drop
 
-# datasource metrics
+# transaction timeout
+quarkus.transaction-manager.default-transaction-timeout=320s
+
+# set batch size to optimise db transactions
+quarkus.hibernate-orm.jdbc.batch_size=100
+
+# Agoral pooling config
+quarkus.datasource.jdbc.max-size=20
+quarkus.datasource.jdbc.min-size=5
+quarkus.datasource.jdbc.initial-size=10
+quarkus.datasource.jdbc.idle-removal-interval=5M
+quarkus.datasource.jdbc.max-lifetime=30M
+
+
+# -------------------------------------------
+# Debuggers
+# -------------------------------------------
+
+# debugger for large/complex db transactions
+quarkus.log.category."com.arjuna".level=DEBUG
+
+# TimeFold solver debuggers
+quarkus.log.category."ai.tim.sol.cor.imp.sol".level=DEBUG
+quarkus.log.category."ai.tim.sol.cor.imp.con".level=DEBUG
+
+# -------------------------------------------
+# Loggers
+# -------------------------------------------
+
+# log datasource metrics
 quarkus.datasource.metrics.enabled=true
 quarkus.datasource.jdbc.enable-metrics=true
 
-# datasource log leak
+# log datasource leak
 quarkus.datasource.jdbc.log-leak-detection=true
 
-# transaction timeout
-quarkus.transaction-manager.default-transaction-timeout=320s
+# log transactions
+quarkus.log.category."org.hibernate.engine.transaction.internal.TransactionImpl".level=DEBUG
+quarkus.log.category."org.hibernate.engine.transaction.spi.AbstractTransactionImpl".level=DEBUG
+quarkus.log.category."org.hibernate.resource.jdbc.internal.LogicalConnectionImpl".level=DEBUG
+quarkus.log.category."org.hibernate.SQL".level=DEBUG
+quarkus.log.category."org.jboss.logging".level=DEBUG
+quarkus.hibernate-orm.statistics=true
+quarkus.hibernate-orm.log-session-metrics=true
+quarkus.hibernate-orm.metrics.enabled=true
 
-# debugger for large/complex db transactions
-quarkus.log.category."com.arjuna".level=DEBUG
+# log sql commands
+# quarkus.hibernate-orm.log.sql=true
+# quarkus.hibernate-orm.format-sql=true
+
+# enable logfile
+quarkus.log.file.enable=true
+quarkus.log.file.path=logs/quarkus.log
+quarkus.log.file.rotation.max-file-size=10M
+quarkus.log.file.rotation.max-backup-index=10