Implemented data model and configured database

src/main/java/com/wellsfargo/counselor/entity/Client.java

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+package com.wellsfargo.counselor.entity;
+
+import jakarta.persistence.*;
+
+@Entity
+public class Client {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long clientId;
+
+    private String name;
+    private String email;
+    private String phoneNumber;
+
+    @ManyToOne
+    @JoinColumn(name = "advisor_id", nullable = false)
+    private FinancialAdvisor advisor;
+
+    @OneToOne(mappedBy = "client", cascade = CascadeType.ALL, orphanRemoval = true)
+    private Portfolio portfolio;
+
+    public Client() {}
+
+    public Client(String name, String email, String phoneNumber, FinancialAdvisor advisor) {
+        this.name = name;
+        this.email = email;
+        this.phoneNumber = phoneNumber;
+        this.advisor = advisor;
+    }
+
+    public Long getClientId() { return clientId; }
+    public String getName() { return name; }
+    public String getEmail() { return email; }
+    public String getPhoneNumber() { return phoneNumber; }
+    public FinancialAdvisor getAdvisor() { return advisor; }
+    public Portfolio getPortfolio() { return portfolio; }
+
+    public void setName(String name) { this.name = name; }
+    public void setEmail(String email) { this.email = email; }
+    public void setPhoneNumber(String phoneNumber) { this.phoneNumber = phoneNumber; }
+}

src/main/java/com/wellsfargo/counselor/entity/FinancialAdvisor.java

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+package com.wellsfargo.counselor.entity;
+
+import jakarta.persistence.*;
+import java.util.List;
+
+@Entity
+public class FinancialAdvisor {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long advisorId;
+
+    private String name;
+    private String email;
+    private String phoneNumber;
+
+    @OneToMany(mappedBy = "advisor", cascade = CascadeType.ALL, orphanRemoval = true)
+    private List<Client> clients;
+
+    public FinancialAdvisor() {}
+
+    public FinancialAdvisor(String name, String email, String phoneNumber) {
+        this.name = name;
+        this.email = email;
+        this.phoneNumber = phoneNumber;
+    }
+
+    public Long getAdvisorId() { return advisorId; }
+    public String getName() { return name; }
+    public String getEmail() { return email; }
+    public String getPhoneNumber() { return phoneNumber; }
+    public List<Client> getClients() { return clients; }
+
+    public void setName(String name) { this.name = name; }
+    public void setEmail(String email) { this.email = email; }
+    public void setPhoneNumber(String phoneNumber) { this.phoneNumber = phoneNumber; }
+}

src/main/java/com/wellsfargo/counselor/entity/Portfolio.java

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+package com.wellsfargo.counselor.entity;
+
+import jakarta.persistence.*;
+import java.util.List;
+
+@Entity
+public class Portfolio {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long portfolioId;
+
+    @OneToOne
+    @JoinColumn(name = "client_id", nullable = false)
+    private Client client;
+
+    @OneToMany(mappedBy = "portfolio", cascade = CascadeType.ALL, orphanRemoval = true)
+    private List<Security> securities;
+
+    public Portfolio() {}
+
+    public Portfolio(Client client) {
+        this.client = client;
+    }
+
+    public Long getPortfolioId() { return portfolioId; }
+    public Client getClient() { return client; }
+    public List<Security> getSecurities() { return securities; }
+}
+

src/main/java/com/wellsfargo/counselor/entity/Security.java

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+package com.wellsfargo.counselor.entity;
+
+
+import jakarta.persistence.*;
+import java.time.LocalDate;
+
+@Entity
+public class Security {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long securityId;
+
+    private String name;
+    private String category;
+    private LocalDate purchaseDate;
+    private double purchasePrice;
+    private int quantity;
+
+    @ManyToOne
+    @JoinColumn(name = "portfolio_id", nullable = false)
+    private Portfolio portfolio;
+
+    public Security() {}
+
+    public Security(String name, String category, LocalDate purchaseDate, double purchasePrice, int quantity, Portfolio portfolio) {
+        this.name = name;
+        this.category = category;
+        this.purchaseDate = purchaseDate;
+        this.purchasePrice = purchasePrice;
+        this.quantity = quantity;
+        this.portfolio = portfolio;
+    }
+
+    public Long getSecurityId() { return securityId; }
+    public String getName() { return name; }
+    public String getCategory() { return category; }
+    public LocalDate getPurchaseDate() { return purchaseDate; }
+    public double getPurchasePrice() { return purchasePrice; }
+    public int getQuantity() { return quantity; }
+    public Portfolio getPortfolio() { return portfolio; }
+}
+