Backend migrated to springboot from firebase

backend/src/main/java/com/rit/ems/model/Announcement.java

@@ -0,0 +1,48 @@
+package com.rit.ems.model;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "ems_announcements")
+public class Announcement {
+    @Id
+    private String id;
+
+    private String title;
+    
+    @Column(columnDefinition = "TEXT")
+    private String content;
+    
+    private String timestamp;
+
+    @Column(name = "sender_role")
+    private String senderRole;
+
+    public Announcement() {}
+
+    public Announcement(String id, String title, String content, String timestamp, String senderRole) {
+        this.id = id;
+        this.title = title;
+        this.content = content;
+        this.timestamp = timestamp;
+        this.senderRole = senderRole;
+    }
+
+    public String getId() { return id; }
+    public void setId(String id) { this.id = id; }
+
+    public String getTitle() { return title; }
+    public void setTitle(String title) { this.title = title; }
+
+    public String getContent() { return content; }
+    public void setContent(String content) { this.content = content; }
+
+    public String getTimestamp() { return timestamp; }
+    public void setTimestamp(String timestamp) { this.timestamp = timestamp; }
+
+    public String getSenderRole() { return senderRole; }
+    public void setSenderRole(String senderRole) { this.senderRole = senderRole; }
+}