Optimize JOIN for a large dataset in SQLite - sqlite

Question

I need to create a table with the running total (aka cumulative sum) per client per day from a large dataset (200 GB). However, my current code is too slow: it has been running for days and still has not finished.
My data came from two tables. The table Orders informs the order id and client id. The table Transactions informs the order id, date and status (status=5 means order approved, status=7 means order rejected).
CREATE TABLE RunningTotal AS
SELECT DISTINCT Orders.ClientId,
Transactions.Date,
SUM(CASE WHEN Transactions.Status = 5 THEN 1 ELSE -1 END) OVER (PARTITION BY Orders.ClientId ORDER BY Transactions.Date) AS RunTotal
FROM Transactions
LEFT JOIN Orders ON Transactions.Order_Id= Orders.Id
WHERE Transactions.Status IN (5,7)
I used a toy table to test and my current code provides the expected results: the net running total of approved order per client per day. The problem seems to be how to optimize it to use with a large dataset. I might be wrong, but I believe my bottleneck is the JOIN. If I run a similar query with just one table, it takes minutes.
The command EXPLAIN QUERY PLAN gives​ me the following:
CO-ROUTINE 3
SEARCH TABLE Transactions USING INDEX idx_trans_status (Status=?)
SEARCH TABLE Orders USING INDEX idx_orders_id (Id=?)
USE TEMP B-TREE FOR ORDER BY
SCAN SUBQUERY 3
USE TEMP B-TREE FOR DISTINCT
USE TEMP B-TREE FOR ORDER BY
EDIT:
The output table would look like:
CREATE TABLE Transactions (
ClientId INTEGER,
Date DATE,
RunTotal INTEGER
PRIMARY KEY (ClientId, Date)
)
ClientId Date RunTotal
-------- ----------- --------
1 2018-12-28 110
1 2018-12-30 125
3 2018-10-15 87
3 2018-11-22 93
3 2018-11-24 99
'Orders' table looks like:
CREATE TABLE Orders (
Id INTEGER,
ClientId INTEGER
Class INTEGER,
Recall INTEGER,
Family INTEGER,
CreationDate DATE,
DeletionDate DATE,
Level INTEGER,
Notes TEXT,
Tags TEXT,
Operator_ID INTEGER,
Node INTEGER,
PRIMARY KEY (Id)
)
'Transactions' table looks like:
CREATE TABLE Transactions (
Id INTEGER,
Order_Id INTEGER,
Date DATE,
Status INTEGER,
Amount INTEGER,
Operator_ID INTEGER,
Notes TEXT,
PRIMARY KEY (Id)
)