diff --git a/wurst/file/SQLite.wurst b/wurst/file/SQLite.wurst
new file mode 100644
index 00000000..c853e697
--- /dev/null
+++ b/wurst/file/SQLite.wurst
@@ -0,0 +1,275 @@
+package SQLite
+import ArrayList
+
+// ============================================================================
+// COMPILETIME ONLY — SQLite JDBC bindings exposed by the WurstScript compiler.
+// These run during compilation (@compiletime functions) and unit tests (@test).
+// They do NOT exist inside Warcraft III at runtime. Do not call any sqlite_*
+// native or use SqlResult / SqliteDb / SQL from code that runs in-game.
+//
+// UPSTREAM DEPENDENCY: Requires wurstscript/WurstScript PR #1180 which adds
+// compiletime SQLite native support to the interpreter. These bindings will
+// not function without that compiler-side change.
+//
+// ERROR BEHAVIOUR: The compiler-side natives throw InterpreterExceptions on
+// failure (invalid handles, SQL errors, JDBC failures). These exceptions are
+// fatal and will abort the compiletime run with an error message. There is no
+// recoverable error path — if sqlite_open, sqlite_prepare, or sqlite_exec
+// fails, compilation stops.
+//
+// SQL INJECTION WARNING: The convenience methods (exec, select, selectFirst,
+// exists, count) accept raw query strings with NO parameterisation. For any
+// query involving dynamic values (user input, computed strings), use the
+// parameterised variants (execPrepared, selectPrepared, selectFirstPrepared)
+// or call the sqlite_prepare/sqlite_bind_* natives directly.
+// ============================================================================
+
+@extern public native sqlite_open(string path) returns int
+@extern public native sqlite_prepare(int conn, string q) returns int
+@extern public native sqlite_bind_int(int stmt, int idx, int val)
+@extern public native sqlite_bind_real(int stmt, int idx, real val)
+@extern public native sqlite_bind_string(int stmt, int idx, string val)
+@extern public native sqlite_step(int stmt) returns boolean
+@extern public native sqlite_column_count(int stmt) returns int
+@extern public native sqlite_column_int(int stmt, int idx) returns int
+@extern public native sqlite_column_real(int stmt, int idx) returns real
+@extern public native sqlite_column_string(int stmt, int idx) returns string
+@extern public native sqlite_reset(int stmt)
+@extern public native sqlite_finalize(int stmt)
+@extern public native sqlite_close(int conn)
+@extern public native sqlite_exec(int conn, string q)
+
+// The compiletime interpreter runs on JVM, so columns are dynamically
+// allocated in ArrayList without hitting JASS array limits.
+
+// ============================================================================
+// SqlResult — a single row from a SELECT query
+// ============================================================================
+
+/** A row returned from a SELECT query. Access columns by index via col(). */
+public class SqlResult
+    ArrayList<string> cols = new ArrayList<string>()
+
+    ondestroy
+        destroy this.cols
+
+    /** Raw string value at column index. */
+    function col(int index) returns string
+        return this.cols.get(index)
+
+    /** Column value parsed as int. */
+    function colInt(int index) returns int
+        return this.cols.get(index).toInt()
+
+    /** Column value parsed as real. */
+    function colReal(int index) returns real
+        return this.cols.get(index).toReal()
+
+    /** Column value as boolean ("1" or "true", case-insensitive → true). */
+    function colBool(int index) returns boolean
+        let v = this.cols.get(index)
+        return v == "1" or v == "true" or v == "TRUE" or v == "True"
+
+    /** Number of columns in this row. */
+    function size() returns int
+        return this.cols.size()
+
+// ============================================================================
+// SqliteDb — OOP wrapper around a database connection
+// ============================================================================
+
+/** Wraps an SQLite database connection with convenience methods. */
+public class SqliteDb
+    private int conn
+
+    /** Opens (or creates) the database at the given path. Use ":memory:" for temporary databases. */
+    construct(string path)
+        this.conn = sqlite_open(path)
+
+    /** Returns the raw connection handle for direct native calls. */
+    function getHandle() returns int
+        return this.conn
+
+    // -- Raw query methods (no parameterisation) --------------------------------
+    // WARNING: These accept raw SQL strings. Do not interpolate untrusted values
+    // into the query string. Use the parameterised variants or the native
+    // sqlite_prepare/sqlite_bind_* functions for dynamic values.
+
+    /** Executes a statement that returns no rows (DDL, INSERT, UPDATE, DELETE). */
+    function exec(string query)
+        sqlite_exec(this.conn, query)
+
+    private function readRow(int stmt, int colCount) returns SqlResult
+        let row = new SqlResult()
+        for i = 0 to colCount - 1
+            row.cols.add(sqlite_column_string(stmt, i))
+        return row
+
+    /** Executes a SELECT and returns all result rows. Caller owns the list
+        and its SqlResult entries — destroy both when done.
+
+        Column count is determined after the first sqlite_step to ensure the
+        JDBC ResultSet metadata is available. */
+    function select(string query) returns ArrayList<SqlResult>
+        let list = new ArrayList<SqlResult>()
+        let stmt = sqlite_prepare(this.conn, query)
+
+        if sqlite_step(stmt)
+            let numCols = sqlite_column_count(stmt)
+            list.add(readRow(stmt, numCols))
+
+            while sqlite_step(stmt)
+                list.add(readRow(stmt, numCols))
+
+        sqlite_finalize(stmt)
+        return list
+
+    /** Executes a SELECT and returns only the first row, or null if no rows match.
+        Caller owns the returned SqlResult — destroy it when done. */
+    function selectFirst(string query) returns SqlResult
+        let stmt = sqlite_prepare(this.conn, query)
+        SqlResult row = null
+
+        if sqlite_step(stmt)
+            let numCols = sqlite_column_count(stmt)
+            row = readRow(stmt, numCols)
+
+        sqlite_finalize(stmt)
+        return row
+
+    /** Returns true if the query produces at least one row. */
+    function exists(string query) returns boolean
+        let stmt = sqlite_prepare(this.conn, query)
+        let found = sqlite_step(stmt)
+        sqlite_finalize(stmt)
+        return found
+
+    /** Runs a "SELECT count(…)" query and returns the first column of the first row as int. */
+    function count(string query) returns int
+        let row = this.selectFirst(query)
+        if row != null
+            let c = row.colInt(0)
+            destroy row
+            return c
+        return 0
+
+    // -- Parameterised query methods -------------------------------------------
+    // These use sqlite_prepare + sqlite_bind_* under the hood. Pass parameter
+    // values as a ArrayList<string>. Each "?" placeholder in the query is bound
+    // to the corresponding list entry (index 1-based for JDBC). All values are
+    // bound as strings; SQLite's type affinity handles coercion.
+
+    /** Binds a list of string parameters to a prepared statement, 1-indexed. */
+    private function bindParams(int stmt, ArrayList<string> params)
+        var idx = 1
+        for p in params
+            sqlite_bind_string(stmt, idx, p)
+            idx++
+
+    /** Executes a parameterised statement that returns no rows.
+        Example: db.execPrepared("INSERT INTO t VALUES (?, ?)", asList("foo", "42")) */
+    function execPrepared(string query, ArrayList<string> params)
+        let stmt = sqlite_prepare(this.conn, query)
+        bindParams(stmt, params)
+        sqlite_step(stmt)
+        sqlite_finalize(stmt)
+
+    /** Executes a parameterised SELECT and returns all result rows.
+        Caller owns the list and its SqlResult entries — destroy both when done. */
+    function selectPrepared(string query, ArrayList<string> params) returns ArrayList<SqlResult>
+        let list = new ArrayList<SqlResult>()
+        let stmt = sqlite_prepare(this.conn, query)
+        bindParams(stmt, params)
+
+        if sqlite_step(stmt)
+            let numCols = sqlite_column_count(stmt)
+            list.add(readRow(stmt, numCols))
+
+            while sqlite_step(stmt)
+                list.add(readRow(stmt, numCols))
+
+        sqlite_finalize(stmt)
+        return list
+
+    /** Executes a parameterised SELECT and returns only the first row, or null. */
+    function selectFirstPrepared(string query, ArrayList<string> params) returns SqlResult
+        let stmt = sqlite_prepare(this.conn, query)
+        bindParams(stmt, params)
+        SqlResult row = null
+
+        if sqlite_step(stmt)
+            let numCols = sqlite_column_count(stmt)
+            row = readRow(stmt, numCols)
+
+        sqlite_finalize(stmt)
+        return row
+
+    /** Returns true if the parameterised query produces at least one row. */
+    function existsPrepared(string query, ArrayList<string> params) returns boolean
+        let stmt = sqlite_prepare(this.conn, query)
+        bindParams(stmt, params)
+        let found = sqlite_step(stmt)
+        sqlite_finalize(stmt)
+        return found
+
+    ondestroy
+        sqlite_close(this.conn)
+
+// ============================================================================
+// SQL — configurable singleton for the common single-database workflow
+// ============================================================================
+
+/** Override this in your package to point at your project database. */
+@configurable public constant SQL_DATABASE_PATH = ":memory:"
+
+/** Singleton database access. Configure the path via SQL_DATABASE_PATH. */
+public class SQL
+    private static SqliteDb db = null
+
+    private static function connection() returns SqliteDb
+        if db == null
+            db = new SqliteDb(SQL_DATABASE_PATH)
+        return db
+
+    static function exec(string query)
+        connection().exec(query)
+
+    static function select(string query) returns ArrayList<SqlResult>
+        return connection().select(query)
+
+    static function selectFirst(string query) returns SqlResult
+        return connection().selectFirst(query)
+
+    static function exists(string query) returns boolean
+        return connection().exists(query)
+
+    static function count(string query) returns int
+        return connection().count(query)
+
+    // -- Parameterised convenience methods --
+
+    static function execPrepared(string query, ArrayList<string> params)
+        connection().execPrepared(query, params)
+
+    static function selectPrepared(string query, ArrayList<string> params) returns ArrayList<SqlResult>
+        return connection().selectPrepared(query, params)
+
+    static function selectFirstPrepared(string query, ArrayList<string> params) returns SqlResult
+        return connection().selectFirstPrepared(query, params)
+
+    static function existsPrepared(string query, ArrayList<string> params) returns boolean
+        return connection().existsPrepared(query, params)
+
+    /** Returns the underlying SqliteDb instance. */
+    static function getDb() returns SqliteDb
+        return connection()
+
+    /** Returns the raw connection handle for direct native calls. */
+    static function getHandle() returns int
+        return connection().getHandle()
+
+    /** Closes the singleton connection. Next call reopens it. */
+    static function close()
+        if db != null
+            destroy db
+            db = null
diff --git a/wurst/file/SQLiteTests.wurst b/wurst/file/SQLiteTests.wurst
new file mode 100644
index 00000000..908e5fd8
--- /dev/null
+++ b/wurst/file/SQLiteTests.wurst
@@ -0,0 +1,390 @@
+package SQLiteTests
+import SQLite
+import ArrayList
+
+function _createTestDb() returns SqliteDb
+    let db = new SqliteDb(":memory:")
+    db.exec("CREATE TABLE heroes (id INTEGER PRIMARY KEY, name TEXT, role TEXT, power_level INTEGER, alive INTEGER)")
+    db.exec("INSERT INTO heroes (name, role, power_level, alive) VALUES ('Arthur', 'Paladin', 9000, 1)")
+    db.exec("INSERT INTO heroes (name, role, power_level, alive) VALUES ('Merlin', 'Mage', 8500, 1)")
+    db.exec("INSERT INTO heroes (name, role, power_level, alive) VALUES ('Robin', 'Archer', 7200, 0)")
+    return db
+
+// --- SqlResult tests ---
+
+@test function test_SqlResult_col_returnsStringValue()
+    let db = _createTestDb()
+    let row = db.selectFirst("SELECT name, role FROM heroes WHERE name = 'Arthur'")
+    row.col(0).assertEquals("Arthur")
+    row.col(1).assertEquals("Paladin")
+    destroy row
+    destroy db
+
+@test function test_SqlResult_colInt_parsesInteger()
+    let db = _createTestDb()
+    let row = db.selectFirst("SELECT power_level FROM heroes WHERE name = 'Arthur'")
+    row.colInt(0).assertEquals(9000)
+    destroy row
+    destroy db
+
+@test function test_SqlResult_colReal_parsesReal()
+    let db = _createTestDb()
+    db.exec("CREATE TABLE stats (val REAL)")
+    db.exec("INSERT INTO stats VALUES (3.14)")
+    let row = db.selectFirst("SELECT val FROM stats")
+    row.colReal(0).assertEquals(3.14, 0.01)
+    destroy row
+    destroy db
+
+@test function test_SqlResult_colBool_parsesOneAsTrue()
+    let db = _createTestDb()
+    let row = db.selectFirst("SELECT alive FROM heroes WHERE name = 'Arthur'")
+    row.colBool(0).assertEquals(true)
+    destroy row
+    destroy db
+
+@test function test_SqlResult_colBool_parsesZeroAsFalse()
+    let db = _createTestDb()
+    let row = db.selectFirst("SELECT alive FROM heroes WHERE name = 'Robin'")
+    row.colBool(0).assertEquals(false)
+    destroy row
+    destroy db
+
+@test function test_SqlResult_size_matchesColumnCount()
+    let db = _createTestDb()
+    let row = db.selectFirst("SELECT name, role, power_level FROM heroes LIMIT 1")
+    row.size().assertEquals(3)
+    destroy row
+    let row2 = db.selectFirst("SELECT name FROM heroes LIMIT 1")
+    row2.size().assertEquals(1)
+    destroy row2
+    destroy db
+
+// --- SqliteDb.select tests ---
+
+@test function test_SqliteDb_select_returnsAllRows()
+    let db = _createTestDb()
+    let rows = db.select("SELECT name FROM heroes ORDER BY name")
+    rows.size().assertEquals(3)
+    rows.get(0).col(0).assertEquals("Arthur")
+    rows.get(1).col(0).assertEquals("Merlin")
+    rows.get(2).col(0).assertEquals("Robin")
+    for row in rows
+        destroy row
+    destroy rows
+    destroy db
+
+@test function test_SqliteDb_select_emptyResultReturnsEmptyList()
+    let db = _createTestDb()
+    let rows = db.select("SELECT name FROM heroes WHERE name = 'Nobody'")
+    rows.size().assertEquals(0)
+    destroy rows
+    destroy db
+
+@test function test_SqliteDb_select_multipleColumns()
+    let db = _createTestDb()
+    let rows = db.select("SELECT name, role, power_level FROM heroes WHERE name = 'Merlin'")
+    rows.size().assertEquals(1)
+    let row = rows.get(0)
+    row.col(0).assertEquals("Merlin")
+    row.col(1).assertEquals("Mage")
+    row.col(2).assertEquals("8500")
+    destroy row
+    destroy rows
+    destroy db
+
+// --- SqliteDb.selectFirst tests ---
+
+@test function test_SqliteDb_selectFirst_returnsSingleRow()
+    let db = _createTestDb()
+    let row = db.selectFirst("SELECT name FROM heroes ORDER BY power_level DESC")
+    row.col(0).assertEquals("Arthur")
+    destroy row
+    destroy db
+
+@test function test_SqliteDb_selectFirst_returnsNullWhenEmpty()
+    let db = _createTestDb()
+    let row = db.selectFirst("SELECT name FROM heroes WHERE name = 'Nobody'")
+    (row == null).assertEquals(true)
+    destroy db
+
+// --- SqliteDb.exists tests ---
+
+@test function test_SqliteDb_exists_trueWhenRowPresent()
+    let db = _createTestDb()
+    db.exists("SELECT 1 FROM heroes WHERE name = 'Arthur'").assertEquals(true)
+    destroy db
+
+@test function test_SqliteDb_exists_falseWhenNoRows()
+    let db = _createTestDb()
+    db.exists("SELECT 1 FROM heroes WHERE name = 'Nobody'").assertEquals(false)
+    destroy db
+
+// --- SqliteDb.count tests ---
+
+@test function test_SqliteDb_count_returnsRowCount()
+    let db = _createTestDb()
+    db.count("SELECT count(*) FROM heroes").assertEquals(3)
+    destroy db
+
+@test function test_SqliteDb_count_withWhereClause()
+    let db = _createTestDb()
+    db.count("SELECT count(*) FROM heroes WHERE alive = 1").assertEquals(2)
+    destroy db
+
+@test function test_SqliteDb_count_zeroWhenEmpty()
+    let db = _createTestDb()
+    db.count("SELECT count(*) FROM heroes WHERE name = 'Nobody'").assertEquals(0)
+    destroy db
+
+// --- SqliteDb.exec tests ---
+
+@test function test_SqliteDb_exec_insert()
+    let db = _createTestDb()
+    db.exec("INSERT INTO heroes (name, role, power_level, alive) VALUES ('Lancelot', 'Knight', 8800, 1)")
+    db.count("SELECT count(*) FROM heroes").assertEquals(4)
+    let row = db.selectFirst("SELECT name FROM heroes WHERE name = 'Lancelot'")
+    row.col(0).assertEquals("Lancelot")
+    destroy row
+    destroy db
+
+@test function test_SqliteDb_exec_update()
+    let db = _createTestDb()
+    db.exec("UPDATE heroes SET power_level = 9999 WHERE name = 'Arthur'")
+    let row = db.selectFirst("SELECT power_level FROM heroes WHERE name = 'Arthur'")
+    row.colInt(0).assertEquals(9999)
+    destroy row
+    destroy db
+
+@test function test_SqliteDb_exec_delete()
+    let db = _createTestDb()
+    db.exec("DELETE FROM heroes WHERE name = 'Robin'")
+    db.count("SELECT count(*) FROM heroes").assertEquals(2)
+    db.exists("SELECT 1 FROM heroes WHERE name = 'Robin'").assertEquals(false)
+    destroy db
+
+@test function test_SqliteDb_exec_createAndDropTable()
+    let db = new SqliteDb(":memory:")
+    db.exec("CREATE TABLE temp (id INTEGER)")
+    db.exists("SELECT 1 FROM sqlite_master WHERE type = 'table' AND name = 'temp'").assertEquals(true)
+    db.exec("DROP TABLE temp")
+    db.exists("SELECT 1 FROM sqlite_master WHERE type = 'table' AND name = 'temp'").assertEquals(false)
+    destroy db
+
+// --- SqliteDb.getHandle escape hatch ---
+
+@test function test_SqliteDb_getHandle_worksWithNativeCalls()
+    let db = _createTestDb()
+    let h = db.getHandle()
+    sqlite_exec(h, "INSERT INTO heroes (name, role, power_level, alive) VALUES ('Gawain', 'Knight', 7500, 1)")
+    let row = db.selectFirst("SELECT name FROM heroes WHERE name = 'Gawain'")
+    row.col(0).assertEquals("Gawain")
+    destroy row
+    destroy db
+
+// --- Parameterised query tests ---
+
+@test function test_SqliteDb_execPrepared_insertsWithParams()
+    let db = _createTestDb()
+    let params = new ArrayList<string>()
+    params.add("Lancelot")
+    params.add("Knight")
+    params.add("8800")
+    params.add("1")
+    db.execPrepared("INSERT INTO heroes (name, role, power_level, alive) VALUES (?, ?, ?, ?)", params)
+    destroy params
+    db.count("SELECT count(*) FROM heroes").assertEquals(4)
+    let row = db.selectFirst("SELECT name, role FROM heroes WHERE name = 'Lancelot'")
+    row.col(0).assertEquals("Lancelot")
+    row.col(1).assertEquals("Knight")
+    destroy row
+    destroy db
+
+@test function test_SqliteDb_selectPrepared_returnsFilteredRows()
+    let db = _createTestDb()
+    let params = new ArrayList<string>()
+    params.add("Paladin")
+    let rows = db.selectPrepared("SELECT name FROM heroes WHERE role = ?", params)
+    destroy params
+    rows.size().assertEquals(1)
+    rows.get(0).col(0).assertEquals("Arthur")
+    for row in rows
+        destroy row
+    destroy rows
+    destroy db
+
+@test function test_SqliteDb_selectFirstPrepared_returnsSingleRow()
+    let db = _createTestDb()
+    let params = new ArrayList<string>()
+    params.add("Arthur")
+    let row = db.selectFirstPrepared("SELECT power_level FROM heroes WHERE name = ?", params)
+    destroy params
+    row.colInt(0).assertEquals(9000)
+    destroy row
+    destroy db
+
+@test function test_SqliteDb_selectFirstPrepared_returnsNullWhenNoMatch()
+    let db = _createTestDb()
+    let params = new ArrayList<string>()
+    params.add("Nobody")
+    let row = db.selectFirstPrepared("SELECT name FROM heroes WHERE name = ?", params)
+    destroy params
+    (row == null).assertEquals(true)
+    destroy db
+
+@test function test_SqliteDb_existsPrepared_trueWhenPresent()
+    let db = _createTestDb()
+    let params = new ArrayList<string>()
+    params.add("Arthur")
+    db.existsPrepared("SELECT 1 FROM heroes WHERE name = ?", params).assertEquals(true)
+    destroy params
+    destroy db
+
+@test function test_SqliteDb_existsPrepared_falseWhenMissing()
+    let db = _createTestDb()
+    let params = new ArrayList<string>()
+    params.add("Nobody")
+    db.existsPrepared("SELECT 1 FROM heroes WHERE name = ?", params).assertEquals(false)
+    destroy params
+    destroy db
+
+@test function test_SqliteDb_execPrepared_preventsInjection()
+    let db = _createTestDb()
+    // This malicious name would drop the table if interpolated as raw SQL
+    let params = new ArrayList<string>()
+    params.add("'); DROP TABLE heroes; --")
+    params.add("Evil")
+    params.add("0")
+    params.add("0")
+    db.execPrepared("INSERT INTO heroes (name, role, power_level, alive) VALUES (?, ?, ?, ?)", params)
+    destroy params
+    // Table should still exist and have 4 rows (3 original + 1 injected-as-data)
+    db.count("SELECT count(*) FROM heroes").assertEquals(4)
+    db.exists("SELECT 1 FROM sqlite_master WHERE type = 'table' AND name = 'heroes'").assertEquals(true)
+    destroy db
+
+// --- SQL singleton tests ---
+
+@test function test_SQL_singleton_execAndSelect()
+    SQL.exec("DROP TABLE IF EXISTS _sgtest1")
+    SQL.exec("CREATE TABLE _sgtest1 (id INTEGER PRIMARY KEY, val TEXT)")
+    SQL.exec("INSERT INTO _sgtest1 VALUES (1, 'hello')")
+    let rows = SQL.select("SELECT val FROM _sgtest1 WHERE id = 1")
+    rows.size().assertEquals(1)
+    rows.get(0).col(0).assertEquals("hello")
+    for row in rows
+        destroy row
+    destroy rows
+    SQL.exec("DROP TABLE _sgtest1")
+    SQL.close()
+
+@test function test_SQL_singleton_selectFirst()
+    SQL.exec("DROP TABLE IF EXISTS _sgtest2")
+    SQL.exec("CREATE TABLE _sgtest2 (n TEXT)")
+    SQL.exec("INSERT INTO _sgtest2 VALUES ('alpha')")
+    SQL.exec("INSERT INTO _sgtest2 VALUES ('beta')")
+    let row = SQL.selectFirst("SELECT n FROM _sgtest2 ORDER BY n")
+    row.col(0).assertEquals("alpha")
+    destroy row
+    SQL.exec("DROP TABLE _sgtest2")
+    SQL.close()
+
+@test function test_SQL_singleton_exists()
+    SQL.exec("DROP TABLE IF EXISTS _sgtest3")
+    SQL.exec("CREATE TABLE _sgtest3 (x INTEGER)")
+    SQL.exec("INSERT INTO _sgtest3 VALUES (42)")
+    SQL.exists("SELECT 1 FROM _sgtest3 WHERE x = 42").assertEquals(true)
+    SQL.exists("SELECT 1 FROM _sgtest3 WHERE x = 99").assertEquals(false)
+    SQL.exec("DROP TABLE _sgtest3")
+    SQL.close()
+
+@test function test_SQL_singleton_count()
+    SQL.exec("DROP TABLE IF EXISTS _sgtest4")
+    SQL.exec("CREATE TABLE _sgtest4 (x INTEGER)")
+    SQL.exec("INSERT INTO _sgtest4 VALUES (1)")
+    SQL.exec("INSERT INTO _sgtest4 VALUES (2)")
+    SQL.exec("INSERT INTO _sgtest4 VALUES (3)")
+    SQL.count("SELECT count(*) FROM _sgtest4").assertEquals(3)
+    SQL.exec("DROP TABLE _sgtest4")
+    SQL.close()
+
+@test function test_SQL_singleton_closeAndReopen()
+    SQL.exec("CREATE TABLE _sgtest5 (v TEXT)")
+    SQL.exec("INSERT INTO _sgtest5 VALUES ('before')")
+    SQL.count("SELECT count(*) FROM _sgtest5").assertEquals(1)
+    SQL.close()
+    // After close on :memory:, previous data is gone — verify a fresh connection works
+    SQL.exec("CREATE TABLE _sgtest5 (v TEXT)")
+    SQL.count("SELECT count(*) FROM _sgtest5").assertEquals(0)
+    SQL.exec("DROP TABLE _sgtest5")
+    SQL.close()
+
+@test function test_SQL_singleton_execPrepared()
+    SQL.exec("DROP TABLE IF EXISTS _sgtest6")
+    SQL.exec("CREATE TABLE _sgtest6 (name TEXT, val TEXT)")
+    let params = new ArrayList<string>()
+    params.add("key1")
+    params.add("value1")
+    SQL.execPrepared("INSERT INTO _sgtest6 VALUES (?, ?)", params)
+    destroy params
+    let row = SQL.selectFirst("SELECT val FROM _sgtest6 WHERE name = 'key1'")
+    row.col(0).assertEquals("value1")
+    destroy row
+    SQL.exec("DROP TABLE _sgtest6")
+    SQL.close()
+
+// --- Edge cases ---
+
+@test function test_SqliteDb_select_orderByDescending()
+    let db = _createTestDb()
+    let rows = db.select("SELECT name, power_level FROM heroes ORDER BY power_level DESC")
+    rows.get(0).col(0).assertEquals("Arthur")
+    rows.get(0).colInt(1).assertEquals(9000)
+    rows.get(1).col(0).assertEquals("Merlin")
+    rows.get(2).col(0).assertEquals("Robin")
+    for row in rows
+        destroy row
+    destroy rows
+    destroy db
+
+@test function test_SqliteDb_select_withLimitAndOffset()
+    let db = _createTestDb()
+    let rows = db.select("SELECT name FROM heroes ORDER BY name LIMIT 2 OFFSET 1")
+    rows.size().assertEquals(2)
+    rows.get(0).col(0).assertEquals("Merlin")
+    rows.get(1).col(0).assertEquals("Robin")
+    for row in rows
+        destroy row
+    destroy rows
+    destroy db
+
+@test function test_SqliteDb_nullValueReturnsEmptyString()
+    let db = new SqliteDb(":memory:")
+    db.exec("CREATE TABLE nullable (a TEXT, b TEXT)")
+    db.exec("INSERT INTO nullable (a) VALUES ('present')")
+    let row = db.selectFirst("SELECT a, b FROM nullable")
+    row.col(0).assertEquals("present")
+    row.col(1).assertEquals("")
+    destroy row
+    destroy db
+
+@test function test_SqliteDb_multipleTablesJoin()
+    let db = new SqliteDb(":memory:")
+    db.exec("CREATE TABLE authors (id INTEGER PRIMARY KEY, name TEXT)")
+    db.exec("CREATE TABLE books (id INTEGER PRIMARY KEY, title TEXT, author_id INTEGER)")
+    db.exec("INSERT INTO authors VALUES (1, 'Tolkien')")
+    db.exec("INSERT INTO books VALUES (1, 'The Hobbit', 1)")
+    let row = db.selectFirst("SELECT b.title, a.name FROM books b JOIN authors a ON a.id = b.author_id")
+    row.col(0).assertEquals("The Hobbit")
+    row.col(1).assertEquals("Tolkien")
+    destroy row
+    destroy db
+
+@test function test_SqliteDb_aggregateQueries()
+    let db = _createTestDb()
+    let row = db.selectFirst("SELECT min(power_level), max(power_level), avg(power_level) FROM heroes")
+    row.colInt(0).assertEquals(7200)
+    row.colInt(1).assertEquals(9000)
+    row.size().assertEquals(3)
+    destroy row
+    destroy db