Fix SQL schema issues across all database engines

- Increase password column from varchar(64) to varchar(255) to
  prevent silent truncation of encrypted passwords
- Add missing UNIQUE constraint on iid in MySQL
- Add missing IX_ident_switch_iid index in PostgreSQL
- Remove deprecated int display width in MySQL (int(10) -> int)
- Fix trailing comma syntax error in SQLite 2018121800 migration
- Normalize indentation across all initial SQL files
- Add migration 2026021000 for all engines to fix existing installs

SQL/postgres.initial.sql

@@ -15,14 +15,14 @@ CREATE TABLE ident_switch
 	username
 		varchar(64),
 	password
-		varchar(64),
+		varchar(255),
 	imap_host
 		varchar(64),
 	imap_port
 		integer
 		CHECK(imap_port > 0 AND imap_port <= 65535),
 	imap_delimiter
-	    char(1),
+		char(1),
 	label
 		varchar(32),
 	flags
@@ -30,26 +30,24 @@ CREATE TABLE ident_switch
 		NOT NULL
 		DEFAULT(0),
 	smtp_host
-	  varchar(64),
-    smtp_port
+		varchar(64),
+	smtp_port
 		integer
 		CHECK(smtp_port > 0 AND smtp_port <= 65535),
 	smtp_auth
-        smallint
-        NOT NULL
-        DEFAULT(1),
-    drafts_mbox
-        varchar(64),
-    sent_mbox
-        varchar(64),
-    junk_mbox
-        varchar(64),
-    trash_mbox
-        varchar(64),
+		smallint
+		NOT NULL
+		DEFAULT(1),
+	drafts_mbox
+		varchar(64),
+	sent_mbox
+		varchar(64),
+	junk_mbox
+		varchar(64),
+	trash_mbox
+		varchar(64),
 	UNIQUE (user_id, label)
 );
 
-CREATE INDEX
-	IX_ident_switch_user_id
-ON
-	ident_switch(user_id);
+CREATE INDEX IX_ident_switch_user_id ON ident_switch(user_id);
+CREATE INDEX IX_ident_switch_iid ON ident_switch(iid);