Added decent logging for event processing.

resources/migrations/sql/create_tables_001.sql

@@ -8,7 +8,8 @@ CREATE TABLE IF NOT EXISTS ledger_internal
     cookie_secret TEXT NOT NULL
 );
 
-INSERT INTO ledger_internal(cookie_secret) VALUES ('aaaabbbbccccddddeeeeffffgggghhhhiiiijjjjkkkk');
+INSERT INTO ledger_internal(cookie_secret)
+VALUES ('aaaabbbbccccddddeeeeffffgggghhhhiiiijjjjkkkk');
 
 CREATE TABLE IF NOT EXISTS users
 (
@@ -104,3 +105,25 @@ CREATE TABLE IF NOT EXISTS cashed_cheques
     FOREIGN KEY (payee_account_id) REFERENCES accounts (id),
     CONSTRAINT double_spending UNIQUE (drawer_user_id, cheque_number) -- no double spending
 );
+
+CREATE TABLE IF NOT EXISTS event_processing_statuses
+(
+    value TEXT PRIMARY KEY
+);
+
+INSERT INTO event_processing_statuses(value)
+VALUES ('processing'),
+       ('completed'),
+       ('error');
+
+
+CREATE TABLE IF NOT EXISTS event_processing_log
+(
+    id     TEXT PRIMARY KEY,
+    event  JSON,
+    status TEXT NOT NULL,
+    received_time DATETIME NOT NULL,
+    completed_time DATETIME,
+    error_message TEXT NOT NULL DEFAULT '',
+    FOREIGN KEY (status) REFERENCES event_processing_statuses (value)
+)