feat: implement database entities, repository, controllers, and data seeder for Notes & PYQs module

backend/.vscode/settings.json

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+{
+    "java.compile.nullAnalysis.mode": "automatic"
+}

backend/src/main/java/com/rit/portal/config/DataInitializer.java

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+package com.rit.portal.config;
+
+import com.rit.portal.entity.NotePyq;
+import com.rit.portal.repository.NotePyqRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+import java.time.LocalDateTime;
+import java.util.Arrays;
+
+@Component
+public class DataInitializer implements CommandLineRunner {
+
+    @Autowired
+    private NotePyqRepository noteRepository;
+
+    @Override
+    public void run(String... args) throws Exception {
+        if (noteRepository.count() == 0) {
+            noteRepository.saveAll(Arrays.asList(
+                NotePyq.builder()
+                    .title("Engineering Mathematics – Unit 1-5")
+                    .subject("Mathematics")
+                    .department("Computer Science & Engineering")
+                    .semester(1)
+                    .fileType("notes")
+                    .downloadUrl("#")
+                    .fileSize("4.2 MB")
+                    .downloadsCount(348)
+                    .uploadedAt(LocalDateTime.now())
+                    .build(),
+                NotePyq.builder()
+                    .title("Physics PYQ 2020-2024")
+                    .subject("Physics")
+                    .department("Computer Science & Engineering")
+                    .semester(1)
+                    .fileType("pyq")
+                    .downloadUrl("#")
+                    .fileSize("8.1 MB")
+                    .downloadsCount(512)
+                    .uploadedAt(LocalDateTime.now())
+                    .build(),
+                NotePyq.builder()
+                    .title("C Programming Complete Notes")
+                    .subject("Programming")
+                    .department("Computer Science & Engineering")
+                    .semester(1)
+                    .fileType("notes")
+                    .downloadUrl("#")
+                    .fileSize("6.3 MB")
+                    .downloadsCount(734)
+                    .uploadedAt(LocalDateTime.now())
+                    .build(),
+                NotePyq.builder()
+                    .title("Data Structures PYQ 2019-2024")
+                    .subject("Data Structures")
+                    .department("Computer Science & Engineering")
+                    .semester(3)
+                    .fileType("pyq")
+                    .downloadUrl("#")
+                    .fileSize("10.2 MB")
+                    .downloadsCount(621)
+                    .uploadedAt(LocalDateTime.now())
+                    .build(),
+                NotePyq.builder()
+                    .title("Circuit Theory Full Notes")
+                    .subject("Circuit Theory")
+                    .department("Electronics & Communication")
+                    .semester(2)
+                    .fileType("notes")
+                    .downloadUrl("#")
+                    .fileSize("5.7 MB")
+                    .downloadsCount(289)
+                    .uploadedAt(LocalDateTime.now())
+                    .build(),
+                NotePyq.builder()
+                    .title("Anna University Syllabus 2021")
+                    .subject("Syllabus")
+                    .department("All Departments")
+                    .semester(1)
+                    .fileType("syllabus")
+                    .downloadUrl("#")
+                    .fileSize("2.1 MB")
+                    .downloadsCount(890)
+                    .uploadedAt(LocalDateTime.now())
+                    .build(),
+                NotePyq.builder()
+                    .title("Thermodynamics Notes")
+                    .subject("Thermodynamics")
+                    .department("Mechanical Engineering")
+                    .semester(3)
+                    .fileType("notes")
+                    .downloadUrl("#")
+                    .fileSize("3.9 MB")
+                    .downloadsCount(201)
+                    .uploadedAt(LocalDateTime.now())
+                    .build(),
+                NotePyq.builder()
+                    .title("Digital Electronics PYQ")
+                    .subject("Digital Electronics")
+                    .department("Electronics & Communication")
+                    .semester(4)
+                    .fileType("pyq")
+                    .downloadUrl("#")
+                    .fileSize("7.3 MB")
+                    .downloadsCount(445)
+                    .uploadedAt(LocalDateTime.now())
+                    .build()
+            ));
+            System.out.println("🌱 Database successfully seeded with Notes & PYQs test data!");
+        }
+    }
+}

backend/src/main/java/com/rit/portal/controller/NotePyqController.java

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+package com.rit.portal.controller;
+
+import com.rit.portal.entity.NotePyq;
+import com.rit.portal.repository.NotePyqRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/notes")
+@CrossOrigin(origins = "*") // CrossOrigin configured globally, but added here for safety
+public class NotePyqController {
+
+    @Autowired
+    private NotePyqRepository noteRepository;
+
+    // Get all notes
+    @GetMapping
+    public List<NotePyq> getAllNotes() {
+        return noteRepository.findAll();
+    }
+
+    // Get notes by semester
+    @GetMapping("/semester/{semester}")
+    public List<NotePyq> getNotesBySemester(@PathVariable Integer semester) {
+        return noteRepository.findBySemester(semester);
+    }
+
+    // Get notes by department
+    @GetMapping("/department")
+    public List<NotePyq> getNotesByDepartment(@RequestParam String dept) {
+        return noteRepository.findByDepartment(dept);
+    }
+
+    // Add a new note metadata
+    @PostMapping
+    public NotePyq createNote(@RequestBody NotePyq note) {
+        return noteRepository.save(note);
+    }
+
+    // Increment downloads count
+    @PostMapping("/{id}/download")
+    public ResponseEntity<Void> incrementDownloads(@PathVariable Long id) {
+        return noteRepository.findById(id).map(note -> {
+            note.setDownloadsCount(note.getDownloadsCount() + 1);
+            note.setFileType(note.getFileType()); // Keep dirty check
+            noteRepository.save(note);
+            return ResponseEntity.ok().<Void>build();
+        }).orElse(ResponseEntity.notFound().build());
+    }
+}

backend/src/main/java/com/rit/portal/entity/NotePyq.java

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+package com.rit.portal.entity;
+
+import jakarta.persistence.*;
+import lombok.*;
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "notes_pyqs")
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class NotePyq {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(nullable = false)
+    private String title;
+
+    @Column(nullable = false)
+    private String subject;
+
+    @Column(nullable = false)
+    private String department;
+
+    @Column(nullable = false)
+    private Integer semester;
+
+    @Column(name = "file_type", nullable = false)
+    private String fileType; // 'notes', 'pyq', 'syllabus', 'assignment'
+
+    @Column(name = "download_url", nullable = false)
+    private String downloadUrl;
+
+    @Column(name = "file_size", nullable = false)
+    private String fileSize;
+
+    @Column(name = "downloads_count")
+    private Integer downloadsCount = 0;
+
+    @Column(name = "uploaded_at")
+    private LocalDateTime uploadedAt = LocalDateTime.now();
+}

backend/src/main/java/com/rit/portal/repository/NotePyqRepository.java

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+package com.rit.portal.repository;
+
+import com.rit.portal.entity.NotePyq;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+import java.util.List;
+
+@Repository
+public interface NotePyqRepository extends JpaRepository<NotePyq, Long> {
+    List<NotePyq> findBySemester(Integer semester);
+    List<NotePyq> findByDepartment(String department);
+    List<NotePyq> findByFileType(String fileType);
+}

backend/src/main/resources/application.properties

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 # ─── DATABASE CONNECTION CONFIGURATION ───
 spring.datasource.url=jdbc:postgresql://localhost:5432/rit_freshers_hub?sslmode=disable
 spring.datasource.username=postgres
-spring.datasource.password=your_local_postgres_password_here
+spring.datasource.password=Amudiesh22@.
 
 # ─── JPA / HIBERNATE SETTINGS ───
 spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect

backend/target/classes/application.properties

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+# ─── DATABASE CONNECTION CONFIGURATION ───
+spring.datasource.url=jdbc:postgresql://localhost:5432/rit_freshers_hub?sslmode=disable
+spring.datasource.username=postgres
+spring.datasource.password=Amudiesh22@.
+
+# ─── JPA / HIBERNATE SETTINGS ───
+spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect
+spring.jpa.hibernate.ddl-auto=validate
+spring.jpa.show-sql=true
+spring.jpa.properties.hibernate.format_sql=true
+
+# ─── SERVER PORT ───
+server.port=8080