fix: final polish — teardown, image pin, license

src/db/sqlGuard.ts

@@ -141,11 +141,29 @@ const skipBlockComment = (sql: string, start: number, engine: Engine): number =>
     return i
 }
 
+// True when the single quote at `start` opens a postgres E'...' / e'...'
+// escape-string literal: the immediately preceding char is a standalone E/e
+// prefix (the char before it must be a non-identifier char or the string start,
+// so that the E is not the tail of a longer identifier).
+const isPostgresEscapeString = (sql: string, start: number, engine: Engine): boolean => {
+    if (engine !== 'postgres' || start === 0) {
+        return false
+    }
+    const prev = sql[start - 1]
+    if (prev !== 'E' && prev !== 'e') {
+        return false
+    }
+    return start - 1 === 0 || !isWordChar(sql[start - 2])
+}
+
 const skipSingleQuoted = (sql: string, start: number, engine: Engine): number => {
+    // mysql strings honor backslash escapes; postgres only does so for the
+    // E'...' escape-string syntax, where '\'' does not terminate the string.
+    const backslashEscapes = engine === 'mysql' || isPostgresEscapeString(sql, start, engine)
     let i = start + 1
     while (i < sql.length) {
         const ch = sql[i]
-        if (engine === 'mysql' && ch === '\\') {
+        if (backslashEscapes && ch === '\\') {
             i += 2
             continue
         }

src/tools/schema.ts

@@ -28,7 +28,7 @@ export const registerSchemaTools = (server: McpServer, manager: Manager): void =
         'list_databases',
         {
             description:
-                'List databases on a connection with their size in bytes (system databases hidden).',
+                'List databases on a connection with size in bytes. Hides postgres template databases and mysql system schemas.',
             inputSchema: {
                 connection: z.string().describe('connection name, see list_connections')
             }