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index – Does PostgreSQL support wildcard indexes on JSON?

I have a multi-tenant service with a table like this:

project_id | user_id | user_properties

Each project belongs to a different customer and customers can freely attach metadata to their users. A project may have millions of users.

Then a customer may want to find some users inside his project filtering with the user_properties (e.g. age grater than X, favorite music equal to Y, etc.)

user_properties can be an arbitrary json of key-value pairs and a customer can run arbitrary queries on the user_properties. The json is not nested (only key-value pairs).

Since a query may return many results it would also be useful to use some sort of pagination (e.g. order by user_id + limit). But pagination, together with arbitrary filters, seems an additional issue for performance…

Is it possible to handle that case in PostgreSQL? Is EAV the only solution?

I see that MongoDB supports wildcard indexes: does PostgreSQL offer anything similar?

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java – Contact Book ~ Must be able to View, Add, Delete & Update. (New Programmer w/ no support)

Due to the amazing assistance I received from this community, I am back to ask for your help to improve once more. To make a long story shorter, I am new to programming and am currently in a Java course. We are diving into new waters for me; OOP, Arrays, Array List, inheritance and Polymorphism. There is little to no assistance outside of the book, and I do not know anyone that programs besides from teachers who leave detailed notes like “Good Job” and “Not Right” without any explanation.

If you could help me get this contact book to work it would be most appreciated, and if you could help me to understand what I do well/ not so well, I would be in your debt!!! (The grade doesn’t matter to me, it is already close enough. What does matter to me is understanding the problems. I want to continue to grow as a programmer.)

Thank you for your time & consideration!


Sample:

  1. List All Contacts
  2. Add a Contact
  3. Update a Contact
  4. Remove a Contact
  5. Exit

2 – Enter a name:
John Smith
Enter an address:
123 Abc Street
Enter a phone number:
555-555-5555
Enter an email address:
johnsmith@gmail.com

  1. List All Contacts
  2. Add a Contact
  3. Update a Contact
  4. Remove a Contact
  5. Exit

2 – Enter a name:
Rachel Jones
Enter an address:
890 Wheel Road
Enter a phone number:
123-456-7890
Enter an email address:
rj900@yahoo.com

  1. List All Contacts
  2. Add a Contact
  3. Update a Contact
  4. Remove a Contact
  5. Exit

1 –
0 – John Smith 123 Abc Street 555-555-5555 johnsmith@gmail.com
1 – Rachel Jones 890 Wheel Road 123-456-7890 rj900@yahoo.com

  1. List All Contacts
  2. Add a Contact
  3. Update a Contact
  4. Remove a Contact
  5. Exit

3 –
0 – John Smith 123 Abc Street 555-555-5555 johnsmith@gmail.com
1 – Rachel Jones 890 Wheel Road 123-456-7890 rj900@yahoo.com
Select a contact number:

1 – Enter a new name:
Rachel Q. Jones
Enter a new address:
54 Washington Ave
Enter a new phone number:
123-456-7890
Enter a new email address:
rj900@yahoo.com


import java.io.IOException;

public class ContactApp extends ContactBook {
    public static void main(String() args) throws IOException {
        ContactBook book = new ContactBook();
        book.menu(); // Menu Loop
    } // end main
} // end class ContactApp

//*******************************************************************************

//*******************************************************************************
//*******************************************************************************

import java.io.Serializable;
import java.util.*;

public class ContactBook extends Contact implements Serializable, Comparator < Contact > {
    Scanner stdIn = new Scanner(System.in);
    private Object Contact;
    private Object ArrayList;
    private List < Contact > contactList = ArrayList < Contact > ();
    protected static int entryTotal = 0; // starting number of contacts

    //*******************************************************************************
    //  ADD
    //*******************************************************************************
    public void add() {
        String name = "", address = "", phone = "", email = "";
        System.out.println("Enter a Name:");
        name = stdIn.nextLine().trim();
        System.out.println("Enter an Address:");
        address = stdIn.nextLine().trim();
        System.out.println("Enter a Phone Number:");
        phone = stdIn.nextLine().trim();
        System.out.println("Enter an Email Address:");
        email = stdIn.nextLine().trim();
        System.out.println();
        if (!(name.equals("(a-zA-z)+") || name.isEmpty() || address.isEmpty() ||
                phone.isEmpty() || email.isEmpty())) {
            Contact contact = new Contact(name, address, phone, email);
            contactList.add(contact);
            System.out.println("--- Addition of Contact was Successful ---");
        } else {
            System.out.println("Incorrect entry; Please try again.");
        }
    } // end add
    //**********************************************************************************
    //  VIEW
    //**********************************************************************************
    public void viewContacts() {
        Collections.sort(contactList, new ContactBook());
        if (contactList.size() == 0) {
            System.out.println("No contacts exist");
        } else {
            for (int index = 0; index < contactList.size(); index++) {
                System.out.print(contactList.get(index));
            }
        }
    } // end viewContacts

    //**********************************************************************************
    //  UPDATE
    //**********************************************************************************
    public void update() {
        int contactTotal = 0;
        String name = "", address = "", phone = "", email = "";

        if (contactList.size() != 0) {
            for (Contact contact: contactList) {
                {
                    System.out.print("First name: ");
                    name = stdIn.nextLine();

                    System.out.print("Address: ");
                    address = stdIn.nextLine();

                    System.out.print("Phone number: ");
                    phone = stdIn.nextLine();

                    System.out.print("E-mail address: ");
                    email = stdIn.nextLine();

                    contact.setName(name);
                    contact.setAddress(address);
                    contact.setEmail(email);
                    contact.setPhone(phone);
                    ++contactTotal;
                }
            }
        } else {
            System.out.print("No contacts are listed on the file.");
        }
        if (contactTotal < 1) {
            System.out.println("nNo contacts were found.");
        }
    } // end update

    //**********************************************************************************
    //  REMOVE
    //**********************************************************************************
    public void remove(int entryTotal) {
        int contactTotal = 0;
        if (contactList.size() != 0) {
            for (Contact contact: contactList) {
                if (contact.getName() != null) {
                    ++contactTotal;
                    contactList.remove(contact);
                    break;
                }
            }
        } else {
            System.out.print("No contacts are listed on the file.");
        }
    } // end remove

    //**********************************************************************************
    // main menu
    //**********************************************************************************
    public void menu() {
        Scanner stdIn = new Scanner(System.in);
        while (true) {
            System.out.println("1) List all Contacts");
            System.out.println("2) Add a Contact");
            System.out.println("3) Update a Contact");
            System.out.println("4) Remove a Contact");
            System.out.println("5) Exit");
            System.out.println("~:");
            String userChoice = stdIn.next();
            if (!userChoice.equals("(a-zA-z)+")) {
                switch (userChoice) {
                    case "1":
                        viewContacts();
                        break;
                    case "2":
                        System.out.println("Add");
                        add();
                        break;
                    case "3":
                        System.out.println("Update");
                        update();
                        break;
                    case "4":
                        remove();
                        break;
                    case "5":
                        System.out.println("Exiting...");
                        System.exit(0);
                        break;
                    default:
                        System.out.println("*** Error ***");
                        System.out.println("Please Follow Directions.");
                        System.out.println("Press the Number of the Desired Action:");
                        break;
                } // end switch
            } else {
                System.out.println("1) List all Contacts");
                System.out.println("2) Add a Contact");
                System.out.println("3) Update a Contact");
                System.out.println("4) Remove a Contact");
                System.out.println("5) Exit");
                System.out.println("~:");
                stdIn.next();
            }
        } // end while loop
    } // end menu loop

    @Override
    public int compare(Contact contact, Contact t1) {
        return 0;
    }
} // end class ContactBook

//*********************************************************************************
//*********************************************************************************
//*********************************************************************************

public class Contact {

    private String name, address, phone, email;

    public Contact() {} // end default constructor

    public Contact(String name, String address, String phone, String email) {
        this.name = name;
        this.address = address;
        this.phone = phone;
        this.email = email;
    } // end constructor

    @Override
    public String toString() {
        return "Contact{" +
                "Name = " + name + 't' +
                ", Address = " + address + 't' +
                ", Phone = " + phone + 't' +
                ", Email = " + email + 't' +
                '}';
    } // end toString

    //********************************************************************************
    // Getter & Setters
    //********************************************************************************
    public String getName() {
        return name;
    }
    public void setName(String name) {
        if (name.matches("(a-zA-Z)+")) {
            this.name = name;
        } else {} // letter validation
    }

    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        if (!address.isEmpty()) {
            this.address = address;
        } else {
            System.out.println("Not a valid entry.");
        } //  Empty input validation
    }

    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        if (phone.matches("-?\d+(\.\d+)?")) {
            this.phone = address;
        } else {
            System.out.println("Not a valid entry.");
        } // number validation
    }

    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        if (email.matches("(a-zA-Z)+")) {
            this.email = email;
        } else {
            System.out.println("Not a valid entry.");
        } // letter validation
    }
    // end getters & setters
} // end Class Contacts

hardware wallet – What is the difference between PSBT support in Coldcard and Trezor?

The 10x Security Bitcoin Guide says that the only two hardware wallets support BIP174 (partially signed Bitcoin transactions, or PSBT). However, this Reddit thread says that “You can use PSBT with Trezor via HWI”. This Github issue elaborates.

What is the difference between the level of support of PSBT between Coldcard / Cobo and Trezor? Should a user care?

entropy – Is mutual information symmetric even when support size changes?

I have some time series data, $mathbf{x}_{1:T} = { x_1, dots, x_T }$ where the observation at time $t$, $X_t$, is a continuous random variable. Let $Y_t$ denote a discrete random variable at time $t$ that, conditioned on the previous $t$ observations, has support over $t$ values. (It is an estimate for each of the previous time points.)

Is this mutual information well-defined?

$$
text{MI}(Y_t, X_t) = mathbb{H}(p(color{red}{Y_{t-1}} mid mathbf{x}_{1:t-1})) – mathbb{E}_{X_t}(p(Y_{t} mid mathbf{x}_{1:t-1}, X_t = x_t)).
$$

In words, I want to know how much information I gain about $Y_t$ by observing $X_t$.

I ask for two reasons:

  1. The maximum entropy of a discrete distribution is a function of the size of support of that distribution. So I am not sure if the left and right terms above are on the same “scale”. I wonder if I should have $Y_t$ instead of $Y_{t-1}$ (in red above) or if there is another way to handle this (assuming it is a problem).

  2. When I approximate $text{MI}(X_t, Y_t)$ using some code, I get a slightly different answer (always slightly larger). And sometimes the value for $text{MI}(Y_t, X_t)$ is negative, and I know that MI is non-negative.

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Does the 2020 Apple M1 MacBook Pro support 2x daisy chained Thunderbolt Displays?

The Apple Silicon based 2020 Apple M1 MacBook Pro supports Thunderbolt version 3 and I’m wondering if anyone has tried connection one to an Apple Thunderbolt Display?

Of course you’d need to use one of Apple’s Thunderbolt 3 to Thunderbolt 2 converters.

I also understand that this version is limited to supporting only a single 4K or 6K display, but since the original Apple Thunderbolt Display is only 2K, could I daisy chain 2x such displays? If you’ve tried it out please share your experience.

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