db_sqlite: use TEXT instead of VARCHAR

VARCHAR(n) is pointless in SQLite and is the same as TEXT. Don't
bother with a migration since they're equivalent.

Also remove some unnecessary DEFAULT NULL statements.

db_sqlite.go

@@ -17,27 +17,27 @@ const sqliteQueryTimeout = 5 * time.Second
 const sqliteSchema = `
 CREATE TABLE User (
 	id INTEGER PRIMARY KEY,
-	username VARCHAR(255) NOT NULL UNIQUE,
-	password VARCHAR(255),
+	username TEXT NOT NULL UNIQUE,
+	password TEXT,
 	admin INTEGER NOT NULL DEFAULT 0,
-	realname VARCHAR(255)
+	realname TEXT
 );
 
 CREATE TABLE Network (
 	id INTEGER PRIMARY KEY,
-	name VARCHAR(255),
+	name TEXT,
 	user INTEGER NOT NULL,
-	addr VARCHAR(255) NOT NULL,
-	nick VARCHAR(255) NOT NULL,
-	username VARCHAR(255),
-	realname VARCHAR(255),
-	pass VARCHAR(255),
-	connect_commands VARCHAR(1023),
-	sasl_mechanism VARCHAR(255),
-	sasl_plain_username VARCHAR(255),
-	sasl_plain_password VARCHAR(255),
-	sasl_external_cert BLOB DEFAULT NULL,
-	sasl_external_key BLOB DEFAULT NULL,
+	addr TEXT NOT NULL,
+	nick TEXT NOT NULL,
+	username TEXT,
+	realname TEXT,
+	pass TEXT,
+	connect_commands TEXT,
+	sasl_mechanism TEXT,
+	sasl_plain_username TEXT,
+	sasl_plain_password TEXT,
+	sasl_external_cert BLOB,
+	sasl_external_key BLOB,
 	enabled INTEGER NOT NULL DEFAULT 1,
 	FOREIGN KEY(user) REFERENCES User(id),
 	UNIQUE(user, addr, nick),
@@ -47,10 +47,10 @@ CREATE TABLE Network (
 CREATE TABLE Channel (
 	id INTEGER PRIMARY KEY,
 	network INTEGER NOT NULL,
-	name VARCHAR(255) NOT NULL,
-	key VARCHAR(255),
+	name TEXT NOT NULL,
+	key TEXT,
 	detached INTEGER NOT NULL DEFAULT 0,
-	detached_internal_msgid VARCHAR(255),
+	detached_internal_msgid TEXT,
 	relay_detached INTEGER NOT NULL DEFAULT 0,
 	reattach_on INTEGER NOT NULL DEFAULT 0,
 	detach_after INTEGER NOT NULL DEFAULT 0,
@@ -62,9 +62,9 @@ CREATE TABLE Channel (
 CREATE TABLE DeliveryReceipt (
 	id INTEGER PRIMARY KEY,
 	network INTEGER NOT NULL,
-	target VARCHAR(255) NOT NULL,
-	client VARCHAR(255),
-	internal_msgid VARCHAR(255) NOT NULL,
+	target TEXT NOT NULL,
+	client TEXT,
+	internal_msgid TEXT NOT NULL,
 	FOREIGN KEY(network) REFERENCES Network(id),
 	UNIQUE(network, target, client)
 );