Try PRAGMA paren-strip again with simpler Rust form

Previous version may have had a subtle issue with &str lifetime in the
clone-vs-use branches. Simpler form with explicit bytes iteration and
guaranteed-owned String returns on both branches.

Targets testCreateTableWithDefaultNowFunction and
testCreateTableWithDefaultExpressions which assert that PRAGMA
table_info returns DEFAULT expressions with outer parens stripped
(matching real SQLite behavior).

Author: JanJakes

.github/workflows/phpunit-tests-turso.yml

@@ -433,6 +433,48 @@ jobs:
           print('patched delete.rs to allow DELETE FROM sqlite_sequence')
           PY_DELETE_SEQ
 
+          # PRAGMA table_info serializes default-expr AST back to a string
+          # and keeps any outer parens. Real SQLite strips one level of
+          # balanced outer parens; match that.
+          python3 - <<'PY_PRAGMA_DEFAULT'
+          p = 'core/translate/pragma.rs'
+          s = open(p).read()
+          old = (
+              "            Some(expr) => {\n"
+              "                program.emit_string8(expr.to_string(), base_reg + 4);\n"
+              "            }\n"
+          )
+          new = (
+              "            Some(expr) => {\n"
+              "                let raw = expr.to_string();\n"
+              "                let bytes = raw.as_bytes();\n"
+              "                let len = bytes.len();\n"
+              "                let stripped: String = if len >= 2 && bytes[0] == b'(' && bytes[len - 1] == b')' {\n"
+              "                    let mut depth: i32 = 0;\n"
+              "                    let mut ok = true;\n"
+              "                    for i in 1..len - 1 {\n"
+              "                        if bytes[i] == b'(' { depth += 1; }\n"
+              "                        else if bytes[i] == b')' {\n"
+              "                            if depth == 0 { ok = false; break; }\n"
+              "                            depth -= 1;\n"
+              "                        }\n"
+              "                    }\n"
+              "                    if ok && depth == 0 {\n"
+              "                        raw[1..len - 1].trim().to_string()\n"
+              "                    } else {\n"
+              "                        raw.clone()\n"
+              "                    }\n"
+              "                } else {\n"
+              "                    raw.clone()\n"
+              "                };\n"
+              "                program.emit_string8(stripped, base_reg + 4);\n"
+              "            }\n"
+          )
+          assert old in s, 'PRAGMA table_info default-emit block not found'
+          open(p, 'w').write(s.replace(old, new, 1))
+          print('patched PRAGMA table_info to strip outer parens from default')
+          PY_PRAGMA_DEFAULT
+
           echo '--- Patched stub! macro ---'
           sed -n '/macro_rules! stub/,/^}$/p' sqlite3/src/lib.rs