Revert "fix: do not override .toJSON of buffers (#949)"

This reverts commit ed52f72.

db-service/lib/cqn2sql.js

@@ -8,7 +8,7 @@ const { Readable } = require('stream')
 
 const DEBUG = cds.debug('sql|sqlite')
 const LOG_SQL = cds.log('sql')
-const LOG_SQLITE = cds.log('sqlite')
+const LOG_SQLITE =  cds.log('sqlite')
 
 class CQN2SQLRenderer {
   /**
@@ -25,7 +25,7 @@ class CQN2SQLRenderer {
     if (cds.env.sql.names === 'quoted') {
       this.class.prototype.name = (name, query) => {
         const e = name.id || name
-        return (query?.target || this.model?.definitions[e])?.['@cds.persistence.name'] || e
+        return (query?.target || this.model?.definitions[e])?.['@cds.persistence.name'] || e 
       }
       this.class.prototype.quote = (s) => `"${String(s).replace(/"/g, '""')}"`
     }
@@ -86,7 +86,7 @@ class CQN2SQLRenderer {
     if (vars && Object.keys(vars).length && !this.values?.length) this.values = vars
     const sanitize_values = process.env.NODE_ENV === 'production' && cds.env.log.sanitize_values !== false
 
-
+    
     if (DEBUG && (LOG_SQL._debug || LOG_SQLITE._debug)) {
       let values = sanitize_values && (this.entries || this.values?.length > 0) ? ['***'] : this.entries || this.values || []
       if (values && !Array.isArray(values)) {
@@ -95,7 +95,7 @@ class CQN2SQLRenderer {
       DEBUG(this.sql, ...values)
     }
 
-
+    
     return this
   }
 
@@ -528,6 +528,9 @@ class CQN2SQLRenderer {
 
   async *INSERT_entries_stream(entries, binaryEncoding = 'base64') {
     const elements = this.cqn.target?.elements || {}
+    const transformBase64 = binaryEncoding === 'base64'
+      ? a => a
+      : a => a != null ? Buffer.from(a, 'base64').toString(binaryEncoding) : a
     const bufferLimit = 65536 // 1 << 16
     let buffer = '['
 
@@ -558,8 +561,8 @@ class CQN2SQLRenderer {
 
           buffer += '"'
         } else {
-          if (val != null && elements[key]?.type in this.BINARY_TYPES) {
-            val = Buffer.from(val, 'base64').toString(binaryEncoding)
+          if (elements[key]?.type in this.BINARY_TYPES) {
+            val = transformBase64(val)
           }
           buffer += `${keyJSON}${JSON.stringify(val)}`
         }
@@ -1146,6 +1149,11 @@ class CQN2SQLRenderer {
   }
 }
 
+// REVISIT: Workaround for JSON.stringify to work with buffers
+Buffer.prototype.toJSON = function () {
+  return this.toString('base64')
+}
+
 Readable.prototype[require('node:util').inspect.custom] = Readable.prototype.toJSON = function () { return this._raw || `[object ${this.constructor.name}]` }
 
 const ObjectKeys = o => (o && [...ObjectKeys(o.__proto__), ...Object.keys(o)]) || []