From 416d6bf86064da70934069b9bb77b00e3eea1b7b Mon Sep 17 00:00:00 2001
From: Christian Decker <decker.christian@gmail.com>
Date: Tue, 18 Jul 2017 22:13:54 +0200
Subject: [PATCH] db: Enable foreign keys and cascade on shachain delete

Should make maintenance a bit easier.
---
 wallet/db.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/wallet/db.c b/wallet/db.c
index ed8307e5b..e6473a4c9 100644
--- a/wallet/db.c
+++ b/wallet/db.c
@@ -30,11 +30,11 @@ char *dbmigrations[] = {
        min_index INTEGER,			 \
        num_valid INTEGER,			 \
        PRIMARY KEY (id));",
-    "CREATE TABLE shachain_known (               \
-       shachain_id INTEGER,			 \
-       pos INTEGER,				 \
-       idx INTEGER,				 \
-       hash BLOB,				 \
+    "CREATE TABLE shachain_known (                                      \
+       shachain_id INTEGER REFERENCES shachains(id) ON DELETE CASCADE,	\
+       pos INTEGER,							\
+       idx INTEGER,							\
+       hash BLOB,							\
        PRIMARY KEY (shachain_id, pos));",
     NULL,
 };
@@ -155,6 +155,10 @@ static struct db *db_open(const tal_t *ctx, char *filename)
 	tal_add_destructor(db, close_db);
 	db->in_transaction = false;
 	db->err = NULL;
+	if (!db_exec(__func__, db, "PRAGMA foreign_keys = ON;")) {
+		fatal("Could not enable foreignkeys on database: %s", db->err);
+	}
+
 	return db;
 }