Identify and Apply Transfers Historically

These SQL scripts modify transactions as to apply transfers historically over migrated data without duplicating transactions. This is useful when you have migrated multiple accounts.

:::caution Before executing any actions, make sure you have a complete backup. :::

:::note This process will only apply when the below conditions are met

The two transactions are related to different accounts
The amounts are exactly the same but inverted e.g. -1.00 and 1.00
The transaction dates are within 3 days of each other
The match only occurs once. This means transfers of equal value following the pattern below will not be applied.
```
`Account A` -> `Account B` -> `Account A/C`

As we cannot reliably tell the order of the transfers.
```

:::

How To

Create a second copy of the backup
Extract the backup
Open the db.sqlite file with your preferred tool SQLite3 cli, heidiSQL, etc.

Run the below query to first view the impacted transactions

sql

SELECT t.id,
    acct,
    a.name,
    amount,
    t.date,
    imported_description,
    t.description,
    t.transferred_id,
    (
        SELECT id
        FROM transactions s
        WHERE s.tombstone = 0
            AND s.id != t.id
            AND starting_balance_flag = 0
            AND s.amount = (t.amount * -1)
            AND s.acct != t.acct
            AND (
                (
                    s.date >= t.date
                    AND s.date <= (t.date + 3)
                )
                OR (
                    s.date <= t.date
                    AND s.date >= (t.date -3)
                )
            )
    ) AS "transferred_id_new",
    (
        SELECT pa.id
        FROM transactions s
            LEFT JOIN payees pa ON s.acct = pa.transfer_acct
        WHERE s.tombstone = 0
            AND s.id != t.id
            AND starting_balance_flag = 0
            AND s.amount = (t.amount * -1)
            AND s.acct != t.acct
            AND (
                (
                    s.date >= t.date
                    AND s.date <= (t.date + 3)
                )
                OR (
                    s.date <= t.date
                    AND s.date >= (t.date -3)
                )
            )
    ) AS "description_new"
FROM transactions t
    LEFT JOIN accounts a ON t.acct = a.id
    LEFT JOIN payees p ON t.description = p.id
    LEFT JOIN accounts ta ON p.transfer_acct = ta.id
WHERE t.tombstone = 0
    AND starting_balance_flag = 0
    AND (
        SELECT COUNT(*)
        FROM transactions s
        WHERE s.tombstone = 0
            AND s.id != t.id
            AND starting_balance_flag = 0
            AND s.amount = (t.amount * -1)
            AND s.acct != t.acct
            AND (
                (
                    s.date >= t.date
                    AND s.date <= (t.date + 3)
                )
                OR (
                    s.date <= t.date
                    AND s.date >= (t.date -3)
                )
            )
    ) = 1
ORDER BY DATE DESC;

Run the below query to update the transactions

sql

UPDATE transactions
SET transferred_id = (
        SELECT s.id
        FROM transactions s
        WHERE s.tombstone = 0
            AND s.id != transactions.id
            AND starting_balance_flag = 0
            AND s.amount = (transactions.amount * -1)
            AND s.acct != transactions.acct
            AND (
                (
                    s.date >= transactions.date
                    AND s.date <= (transactions.date + 3)
                )
                OR (
                    s.date <= transactions.date
                    AND s.date >= (transactions.date -3)
                )
            )
    ),
    description = (
        SELECT pa.id
        FROM transactions s
            LEFT JOIN payees pa ON s.acct = pa.transfer_acct
        WHERE s.tombstone = 0
            AND s.id != transactions.id
            AND starting_balance_flag = 0
            AND s.amount = (transactions.amount * -1)
            AND s.acct != transactions.acct
            AND (
                (
                    s.date >= transactions.date
                    AND s.date <= (transactions.date + 3)
                )
                OR (
                    s.date <= transactions.date
                    AND s.date >= (transactions.date -3)
                )
            )
    )
WHERE tombstone = 0
    AND starting_balance_flag = 0
    AND (
        SELECT COUNT(*)
        FROM transactions s
        WHERE s.tombstone = 0
            AND s.id != transactions.id
            AND starting_balance_flag = 0
            AND s.amount = (transactions.amount * -1)
            AND s.acct != transactions.acct
            AND (
                (
                    s.date >= transactions.date
                    AND s.date <= (transactions.date + 3)
                )
                OR (
                    s.date <= transactions.date
                    AND s.date >= (transactions.date -3)
                )
            )
    ) = 1;

Zip the db.sqlite file with the original metadata.json file
Follow the restore process to apply these into your Actual Server instance
Verify your balances are correct and you see the correct transactions marked as transfers!