diff --git a/CHANGELOG.md b/CHANGELOG.md
index ce764a9..6b70a17 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,8 @@
 + \[BREAKING] Changed the behavior of `makelist()`: now it's also a decorator, converting its return type to a list (revertable with `wrap=False`)
 + New module `lex` with functions `symbol_table()` and `lex()` — make tokenization more affordable
 + Add `dorks` module and `flask.harden()`
-+ Added `addattr()`
++ Add `sqlalchemy.bool_column()`: make making flags painless
++ Added `addattr()`, `PrefixIdentifier()`
 
 ## 0.3.6
 
diff --git a/pyproject.toml b/pyproject.toml
index 58766fa..9ef670d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,9 +37,7 @@ sqlalchemy = [
 ]
 flask = [
     "Flask>=2.0.0",
-    "Flask-RestX",
-    "Quart",
-    "Quart-Schema"
+    "Flask-RestX"
 ]
 flask_sqlalchemy = [
     "Flask-SqlAlchemy",
@@ -50,6 +48,21 @@ peewee = [
 markdown = [
     "markdown>=3.0.0"
 ]
+quart = [
+    "Flask>=2.0.0",
+    "Quart",
+    "Quart-Schema",
+    "uvloop; os_name=='posix'"
+]
+
+full = [
+    "sakuragasaki46-suou[sqlalchemy]",
+    "sakuragasaki46-suou[flask]",
+    "sakuragasaki46-suou[quart]",
+    "sakuragasaki46-suou[peewee]",
+    "sakuragasaki46-suou[markdown]"
+]
+
 
 [tool.setuptools.dynamic]
 version = { attr = "suou.__version__" }
diff --git a/src/suou/sqlalchemy.py b/src/suou/sqlalchemy.py
index edd1b02..b16cae7 100644
--- a/src/suou/sqlalchemy.py
+++ b/src/suou/sqlalchemy.py
@@ -20,7 +20,7 @@ from abc import ABCMeta, abstractmethod
 from functools import wraps
 from typing import Callable, Iterable, Never, TypeVar
 import warnings
-from sqlalchemy import BigInteger, CheckConstraint, Date, Dialect, ForeignKey, LargeBinary, Column, MetaData, SmallInteger, String, create_engine, select, text
+from sqlalchemy import BigInteger, Boolean, CheckConstraint, Date, Dialect, ForeignKey, LargeBinary, Column, MetaData, SmallInteger, String, create_engine, select, text
 from sqlalchemy.orm import DeclarativeBase, Session, declarative_base as _declarative_base, relationship
 
 from .snowflake import SnowflakeGen
@@ -120,7 +120,17 @@ def match_column(length: int, regex: str, /, case: StringCase = StringCase.AS_IS
             constraint_name=constraint_name or f'{x.__tablename__}_{n}_valid')), *args, **kwargs)
 
 
-def declarative_base(domain_name: str, master_secret: bytes, metadata: dict | None = None, **kwargs):
+def bool_column(value: bool = False, nullable: bool = False, **kwargs):
+    """
+    Column for a single boolean value.
+
+    NEW in 0.4.0
+    """
+    def_val = text('true') if value else text('false')
+    return Column(Boolean, server_default=def_val, nullable=nullable, **kwargs)
+
+
+def declarative_base(domain_name: str, master_secret: bytes, metadata: dict | None = None, **kwargs) -> DeclarativeBase:
     """
     Drop-in replacement for sqlalchemy.orm.declarative_base()
     taking in account requirements for SIQ generation (i.e. domain name).
diff --git a/src/suou/strtools.py b/src/suou/strtools.py
new file mode 100644
index 0000000..2381953
--- /dev/null
+++ b/src/suou/strtools.py
@@ -0,0 +1,44 @@
+"""
+Utilities for string manipulation.
+
+Why `strtools`? Why not `string`? I just~ happen to not like it
+
+---
+
+Copyright (c) 2025 Sakuragasaki46.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+See LICENSE for the specific language governing permissions and
+limitations under the License.
+
+This software is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+"""
+
+
+from typing import Callable, Iterable
+
+from .itertools import makelist
+
+class PrefixIdentifier:
+    _prefix: str
+
+    def __init__(self, prefix: str | None, validators: Iterable[Callable[[str], bool]] | Callable[[str], bool] | None = None):
+        prefix = '' if prefix is None else prefix
+        if not isinstance(prefix, str):
+            raise TypeError
+        validators = makelist(validators, wrap=False)
+        for validator in validators:
+            if not validator(prefix):
+                raise ValueError('invalid prefix')
+        self._prefix = prefix 
+    
+    def __getattr__(self, key: str):
+        return f'{self._prefix}{key}'
+
+    def __getitem__(self, key: str) -> str:
+        return f'{self._prefix}{key}'
+
+__all__ = ('PrefixIdentifier',)
+
diff --git a/tests/test_codecs.py b/tests/test_codecs.py
new file mode 100644
index 0000000..7ac70d6
--- /dev/null
+++ b/tests/test_codecs.py
@@ -0,0 +1,50 @@
+
+
+import binascii
+import unittest
+from suou.codecs import b64encode, b64decode
+
+B1 = b'N\xf0\xb4\xc3\x85\n\xf9\xb6\x9a\x0f\x82\xa6\x99G\x07#'
+B2 = b'\xbcXiF,@|{\xbe\xe3\x0cz\xa8\xcbQ\x82'
+B3 = b"\xe9\x18)\xcb'\xc2\x96\xae\xde\x86"
+B4 = B1[-2:] + B2[:-2]
+B5 = b'\xff\xf8\xa7\x8a\xdf\xff'
+
+
+class TestCodecs(unittest.TestCase):
+    def setUp(self) -> None:
+        ...
+    def tearDown(self) -> None:
+        ...
+
+    #def runTest(self):
+    #    self.test_b64encode()
+    #    self.test_b64decode()
+
+    def test_b64encode(self):
+        self.assertEqual(b64encode(B1), 'TvC0w4UK-baaD4KmmUcHIw')
+        self.assertEqual(b64encode(B2), 'vFhpRixAfHu-4wx6qMtRgg')
+        self.assertEqual(b64encode(B3), '6RgpyyfClq7ehg')
+        self.assertEqual(b64encode(B4), 'ByO8WGlGLEB8e77jDHqoyw')
+        self.assertEqual(b64encode(B5), '__init__')
+        self.assertEqual(b64encode(B1[:4]), 'TvC0ww')
+        self.assertEqual(b64encode(b'\0' + B1[:4]), 'AE7wtMM')
+        self.assertEqual(b64encode(b'\0\0\0\0\0' + B1[:4]), 'AAAAAABO8LTD')
+        self.assertEqual(b64encode(b'\xff'), '_w')
+        self.assertEqual(b64encode(b''), '')
+    
+    def test_b64decode(self):
+        self.assertEqual(b64decode('TvC0w4UK-baaD4KmmUcHIw'), B1)
+        self.assertEqual(b64decode('vFhpRixAfHu-4wx6qMtRgg'), B2)
+        self.assertEqual(b64decode('6RgpyyfClq7ehg'), B3)
+        self.assertEqual(b64decode('ByO8WGlGLEB8e77jDHqoyw'), B4)
+        self.assertEqual(b64decode('__init__'), B5)
+        self.assertEqual(b64decode('TvC0ww'), B1[:4])
+        self.assertEqual(b64decode('AE7wtMM'), b'\0' + B1[:4])
+        self.assertEqual(b64decode('AAAAAABO8LTD'), b'\0\0\0\0\0' + B1[:4])
+        self.assertEqual(b64decode('_w'), b'\xff')
+        self.assertEqual(b64decode(''), b'')
+
+        self.assertRaises(binascii.Error, b64decode, 'C')
+
+        
diff --git a/tests/test_strtools.py b/tests/test_strtools.py
new file mode 100644
index 0000000..d07ed88
--- /dev/null
+++ b/tests/test_strtools.py
@@ -0,0 +1,38 @@
+
+
+
+import unittest
+
+from suou.strtools import PrefixIdentifier
+
+class TestStrtools(unittest.TestCase):
+    def setUp(self) -> None:
+        ...
+
+    def tearDown(self) -> None:
+        ...
+
+    def test_PrefixIdentifier_empty(self):
+        pi = PrefixIdentifier(None)
+        self.assertEqual(pi.hello, 'hello')
+        self.assertEqual(pi['with spaces'], 'with spaces')
+        self.assertEqual(pi['\x1b\x00'], '\x1b\0')
+        self.assertEqual(pi.same_thing, pi['same_thing'])
+
+        with self.assertRaises(TypeError):
+            pi[0]
+
+        self.assertEqual(PrefixIdentifier(None), PrefixIdentifier(''))
+
+    def test_PrefixIdentifier_invalid(self):
+        with self.assertRaises(TypeError):
+            pi = PrefixIdentifier(1)
+            pi.hello
+
+        with self.assertRaises(TypeError):
+            PrefixIdentifier([99182])
+        
+        with self.assertRaises(TypeError):
+            PrefixIdentifier(b'alpha_')
+    
+    
\ No newline at end of file