diff --git a/src/lib/stat/csv.hpp b/src/lib/stat/csv.hpp
index d807210f3..b4212b218 100644
--- a/src/lib/stat/csv.hpp
+++ b/src/lib/stat/csv.hpp
@@ -104,6 +104,35 @@ namespace stat {
   }
   
   
+  /** parse string representation into typed value */
+  template<typename TAR>
+  inline TAR
+  parseAs (string const& encodedVal)
+  {
+      std::istringstream converter{encodedVal};
+      TAR value;
+      converter >> value;
+      if (converter.fail())
+          throw error::Invalid{_Fmt{"unable to parse \"%s\""} % encodedVal};
+      return value;
+  }
+  
+  template<>
+  inline bool
+  parseAs(string const& encodedBool)
+  {
+      return util::boolVal(encodedBool);
+  }
+  template<>
+  inline string
+  parseAs(string const& string)
+  {
+      return string; // pass-through (even if empty)
+  }
+  
+  
+  
+  
   /**
    * Parser to split one line of CSV data into fields.
    * @remarks iterator-like throw-away object
@@ -123,7 +152,7 @@ namespace stat {
       size_t   pos_;
 
     public:
-      CsvLine (string const& line)
+      CsvLine (string& line)        // NOTE: string must exist elsewhere
         : MatchSeq(line, ACCEPT_FIELD)
         , line_{line}
         , field_{0}
diff --git a/src/lib/stat/data.hpp b/src/lib/stat/data.hpp
index d1c7edae9..494766de8 100644
--- a/src/lib/stat/data.hpp
+++ b/src/lib/stat/data.hpp
@@ -22,7 +22,7 @@
 
 
 /** @file data.hpp
- ** Manage a table with time series data, stored persistently as CSV.
+ ** Manage a table with data records, stored persistently as CSV.
  ** In the context of observations, configuration, calibration and QA, a series
  ** of measurement data taken over time is often evaluated statistically, to distill
  ** typical averages, variances and trends. Short of using a database, a modest
@@ -135,34 +135,6 @@ namespace stat{
   
   
   
-  /** parse string representation into typed value */
-  template<typename TAR>
-  inline TAR
-  parseAs (string const& encodedVal)
-  {
-      std::istringstream converter{encodedVal};
-      TAR value;
-      converter >> value;
-      if (converter.fail())
-          throw error::Invalid{_Fmt{"unable to parse \"%s\""} % encodedVal};
-      return value;
-  }
-  
-  template<>
-  inline bool
-  parseAs(string const& encodedBool)
-  {
-      return util::boolVal(encodedBool);
-  }
-  template<>
-  inline string
-  parseAs(string const& string)
-  {
-      return string; // pass-through (even if empty)
-  }
-  
-  
-  
   
   
   /**
diff --git a/tests/15library.tests b/tests/15library.tests
index e965bc08e..ad0d0d684 100644
--- a/tests/15library.tests
+++ b/tests/15library.tests
@@ -180,7 +180,7 @@ return: 0
 END
 
 
-PLANNED "Filesystem manipulations" FileSupport_test <<END
+TEST "Filesystem manipulations" FileSupport_test <<END
 return: 0
 END
 
diff --git a/tests/16calculation.tests b/tests/16calculation.tests
index b8509d815..99defe274 100644
--- a/tests/16calculation.tests
+++ b/tests/16calculation.tests
@@ -2,7 +2,7 @@ TESTING "Library Test Suite: calculation" ./test-suite --group=calculation
 
 
 
-PLANNED "Data Table with CSV storage" DataCSV_test <<END
+TEST "Data Table with CSV storage" DataCSV_test <<END
 return: 0
 END
 
diff --git a/tests/library/stat/data-csv-test.cpp b/tests/library/stat/data-csv-test.cpp
index 3f254fb0b..6f4ccf2de 100644
--- a/tests/library/stat/data-csv-test.cpp
+++ b/tests/library/stat/data-csv-test.cpp
@@ -27,31 +27,23 @@
 
 #include "lib/test/run.hpp"
 #include "lib/test/test-helper.hpp"
+#include "lib/test/temp-dir.hpp"
 #include "lib/stat/data.hpp"
-//#include "lib/time/timevalue.hpp"
-//#include "lib/error.hpp"
-//#include "lib/util-foreach.hpp"
+#include "lib/time/timevalue.hpp"
+#include "lib/format-cout.hpp"
 #include "lib/util.hpp"
-#include "lib/format-cout.hpp"            ///////////////////////TODO
-#include "lib/test/diagnostic-output.hpp" ///////////////////////TODO
 
-//#include <functional>
+#include <sstream>
 #include <string>
 #include <vector>
 
-//using lumiera::Error;
-//using lumiera::LUMIERA_ERROR_EXCEPTION;
-//using lumiera::error::LUMIERA_ERROR_ASSERTION;
-//using lib::time::TimeVar;
-//using lib::time::Time;
-
-//using boost::algorithm::is_lower;
-//using boost::algorithm::is_digit;
 using util::isnil;
-//using std::function;
+using lib::time::Time;
+using lib::test::TempDir;
+using std::make_tuple;
 using std::string;
 using std::vector;
-using std::make_tuple;
+
 
 
 namespace lib {
@@ -60,14 +52,15 @@ namespace test{
   
   namespace {//Setup for test
     
+    
     /** Define the layout of a data row */
     struct TableForm
     {
-        Column<string>  id{"ID"};
+        Column<string>  id{"ID"};     //   ◁────── names given here must match first storage line
         Column<double> val{"Value"};
         Column<int>    off{"Offset"};
     
-        auto allColumns()
+        auto allColumns()         //   ◁────────── mandatory function; defines actual sequence of columns
         {   return std::tie(id
                            ,val
                            ,off
@@ -80,7 +73,6 @@ namespace test{
   }//(End)Test setup
   
   using error::LUMIERA_ERROR_STATE;
-  using error::LUMIERA_ERROR_INVALID;
   
   
   
@@ -232,63 +224,126 @@ namespace test{
       void
       verify_CSV_Format()
         {
-          string line;
           double val = 1.0 / 3;
+          CHECK (util::toString(val)              == "0.33333333"_expect         );
+          CHECK (util::showDecimal(val)           == "0.333333333333333"_expect  );
+          CHECK (util::showComplete(val)          == "0.33333333333333331"_expect);
+          CHECK (boost::lexical_cast<string>(val) == "0.33333333333333331"_expect);
+          
+          CHECK (format4Csv(double(1) / 3) == "0.333333333333333"_expect   );
+          CHECK (format4Csv(float(1) / 3)  == "0.333333"_expect            );
+          CHECK (format4Csv(f128(1) / 3)   == "0.333333333333333333"_expect);
+          CHECK (format4Csv(bool(1))       == "true"_expect );
+          CHECK (format4Csv(bool(0))       == "false"_expect);
+          CHECK (format4Csv("Starship-3")  == "\"Starship-3\""_expect ); // 3rd test today ;-)
+          CHECK (format4Csv(Time(1,2,25,13)) == "\"13:25:02.001\""_expect);
+          
+          
+          string line;
           int64_t ii = -100000;
+          bool boo   = true;
           
           appendCsvField (line, ii);
           CHECK (line == "-100000"_expect);
-SHOW_EXPR(val)
-SHOW_EXPL(val)
-SHOW_EXPR(std::to_string(val))
-SHOW_EXPR(format4Csv(val));
-SHOW_EXPR(util::showDecimal(val))
-SHOW_EXPR(util::showComplete(val))
-          double vval = parseAs<double>(format4Csv(val));
-SHOW_EXPR(vval)
-SHOW_EXPL(vval)
-SHOW_EXPR(std::to_string(vval))
-SHOW_EXPR(format4Csv(vval));
-SHOW_EXPR(util::showDecimal(val))
-SHOW_EXPR(util::showComplete(val))
-          vval = parseAs<double>(boost::lexical_cast<string>(val));
-SHOW_EXPR(vval)
-SHOW_EXPL(vval)
-SHOW_EXPR(std::to_string(vval))
-SHOW_EXPR(format4Csv(vval));
-SHOW_EXPR(util::showDecimal(val))
-SHOW_EXPR(util::showComplete(val))
-          bool boo;
-SHOW_EXPR(boo);
-SHOW_EXPL(boo)
-SHOW_EXPR(std::to_string(boo))
-SHOW_EXPR(format4Csv(boo));
-SHOW_EXPR(format4Csv(-42));
-SHOW_EXPR(format4Csv(uint64_t(-42)));
-          auto moo = f128(1) / 3;
-SHOW_EXPR(moo)
-SHOW_EXPL(moo)
-SHOW_EXPR(std::to_string(moo))
-SHOW_EXPR(format4Csv(moo));
-SHOW_EXPR(util::showDecimal(moo))
-SHOW_EXPR(util::showComplete(moo))
-          auto oo = 1.0f / 3;
-SHOW_EXPR(oo)
-SHOW_EXPL(oo)
-SHOW_EXPR(std::to_string(oo))
-SHOW_EXPR(format4Csv(oo));
-SHOW_EXPR(util::showDecimal(oo))
-SHOW_EXPR(util::showComplete(oo))
-SHOW_EXPR(format4Csv(lib::time::Time(1,2,3,4)));
+          appendCsvField (line, val);
+          CHECK (line == "-100000,0.333333333333333"_expect);
+          appendCsvField (line, boo);
+          CHECK (line == "-100000,0.333333333333333,true"_expect);
+          appendCsvField (line, "Raptor");
+          CHECK (line == "-100000,0.333333333333333,true,\"Raptor\""_expect);
+          
+          
+          CsvLine csvLine(line);
+          CHECK (csvLine.isValid());
+          CHECK (*csvLine == "-100000"_expect);
+          CHECK (-100000 == parseAs<int>(*csvLine));
+          ++csvLine;
+          CHECK (csvLine.isValid());
+          CHECK (*csvLine == "0.333333333333333"_expect);
+          CHECK (0.333333343f == parseAs<float>(*csvLine));
+          ++csvLine;
+          CHECK (csvLine.isValid());
+
+          CHECK (*csvLine == "true"_expect);
+          CHECK (true == parseAs<bool>(*csvLine));
+          ++csvLine;
+          CHECK (csvLine.isValid());
+          CHECK (*csvLine == "Raptor"_expect);
+          CHECK ("Raptor" == parseAs<string>(*csvLine));
+          ++csvLine;
+          CHECK (not csvLine.isValid());
+          
+          line = " ◐0◑. ; \t \"' \" \n ,oh my ;";
+          CsvLine horror(line);
+          CHECK ("◐0◑." == *horror);           // as far as our CSV format is concerned, this is valid
+          CHECK (0 == horror.getParsedFieldCnt());
+          ++horror;
+          CHECK (1 == horror.getParsedFieldCnt());
+          CHECK ("' " == *horror);
+          ++horror;
+          CHECK ("oh" == *horror);
+          CHECK (2 == horror.getParsedFieldCnt());
+          
+          // next field is not quoted, but contains space
+          VERIFY_FAIL (",oh |↯|my ;", ++horror );
+          
+          CHECK (not horror.isValid());
+          CHECK (horror.isParseFail());
         }
       
       
-      /** @test verify a table backed by persistent CSV data
-       */
+      /** @test verify a table backed by persistent CSV data */
       void
       verify_persistentDataFile()
         {
-          UNIMPLEMENTED("Arrrröööh");
+          TempDir temp;
+          // prepare a data file to load into the table...
+          fs::path f = temp.makeFile("dataz.csv");
+          std::ofstream content{f};
+          content << R"("ID", "Value", "Offset")"<<endl
+                  << R"(  "one" , 5.5 ;    +1  )"<<endl
+                  << R"(;" 0 ";0)"               <<endl;  //   ◁────── demonstrating some leeway in storage format
+          content.close();
+          
+          TestTab dat{f};
+          CHECK (2 == dat.size());
+          CHECK ("ID"  == dat.id.header);
+          CHECK ("Value" == dat.val.header);
+          CHECK ("Offset" == dat.off.header);
+          //Note: data is reversed in storage — last/newest line first
+          CHECK ("one" == string{dat.id});
+          CHECK ( 5.5  == dat.val);
+          CHECK (  1   == dat.off);
+          CHECK (dat.id.data    == vector<string>({"","one"}));
+          CHECK (dat.val.data   == vector<double>({0 ,5.5  }));
+          CHECK (dat.off.data   == vector<int>   ({0 ,1    }));
+          
+          // can modify some values....
+          dat.id = "mid";
+          dat.dupRow();
+          dat.id = "last";
+          dat.off *= -1;
+          // can dump the contents as CSV
+          CHECK (dat.dumpCSV() ==
+R"("",0,0
+"mid",5.5,1
+"last",5.5,-1
+)"_expect);
+          
+          // save complete table in current state, overwriting on disk
+          dat.save();
+          
+          // read back data rewritten on disk...
+          std::ifstream readback{f};
+          std::ostringstream inBuff;
+          inBuff << readback.rdbuf();
+          CHECK (inBuff.str() ==
+R"("ID","Value","Offset"
+"last",5.5,-1
+"mid",5.5,1
+"",0,0
+)"_expect);
+         // note again the reversed order in storage: last line at top
         }
     };
   
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 201aadd78..52fc6b94f 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -112013,8 +112013,8 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node COLOR="#435e98" CREATED="1710114593043" ID="ID_1270108404" MODIFIED="1710114618631" TEXT="git read-tree"/>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1710085479914" ID="ID_1739991591" MODIFIED="1710114641924" TEXT="minimale Integration in die Lumiera-Codebase">
-<icon BUILTIN="pencil"/>
+<node COLOR="#338800" CREATED="1710085479914" ID="ID_1739991591" MODIFIED="1710466419905" TEXT="minimale Integration in die Lumiera-Codebase">
+<icon BUILTIN="button_ok"/>
 <node COLOR="#338800" CREATED="1710085492857" ID="ID_4363413" MODIFIED="1710124911666" TEXT="Lumiera-GNU-Style">
 <icon BUILTIN="button_ok"/>
 </node>
@@ -112024,9 +112024,9 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node COLOR="#338800" CREATED="1710085513597" ID="ID_1623287366" MODIFIED="1710124916786" TEXT="Fehler durch Lumiera-Errors ausdr&#xfc;cken">
 <icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1710085528964" ID="ID_197737968" MODIFIED="1710124923723" TEXT="Lumiera&apos;s Format-Funktionen verwenden">
-<icon BUILTIN="pencil"/>
-<node BACKGROUND_COLOR="#f0d5c5" COLOR="#990033" CREATED="1710114655354" ID="ID_685893002" MODIFIED="1710114679967" TEXT="zu kl&#xe4;ren: vollst&#xe4;ndige floatingpoint-Repr&#xe4;sentation?">
+<node COLOR="#338800" CREATED="1710085528964" ID="ID_197737968" MODIFIED="1710460904274" TEXT="Lumiera&apos;s Format-Funktionen verwenden">
+<icon BUILTIN="button_ok"/>
+<node COLOR="#435e98" CREATED="1710114655354" ID="ID_685893002" MODIFIED="1710460902224" TEXT="zu kl&#xe4;ren: vollst&#xe4;ndige floatingpoint-Repr&#xe4;sentation?">
 <icon BUILTIN="help"/>
 <node CREATED="1710114695652" ID="ID_323709862" MODIFIED="1710114697384" TEXT="std::numeric_limits&lt;VAL&gt;::digits10"/>
 <node CREATED="1710114699873" ID="ID_496274436" MODIFIED="1710114711248" TEXT="util::toString sollte lexical_cast verwenden...">
@@ -112110,8 +112110,9 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <font ITALIC="true" NAME="SansSerif" SIZE="14"/>
 <icon BUILTIN="yes"/>
 </node>
-<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1710377772401" ID="ID_96383520" MODIFIED="1710432999927" TEXT="Funktion umschreiben und in das Format-Framework integrieren">
-<icon BUILTIN="pencil"/>
+</node>
+<node COLOR="#338800" CREATED="1710377772401" ID="ID_96383520" MODIFIED="1710460889268" TEXT="Funktion umschreiben und in das Format-Framework integrieren">
+<icon BUILTIN="button_ok"/>
 <node COLOR="#338800" CREATED="1710433003432" ID="ID_1577076163" MODIFIED="1710433096279" TEXT="neue explizite Format-Funktionen">
 <icon BUILTIN="button_ok"/>
 <node COLOR="#435e98" CREATED="1710433012315" ID="ID_1406333897" MODIFIED="1710433101135" TEXT="showDecimal &#x27f6; digits10"/>
@@ -112123,9 +112124,8 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node COLOR="#338800" CREATED="1710433074435" ID="ID_1236251004" MODIFIED="1710433095113" TEXT="format4csv : bleibt als generisches front-End">
 <icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1710433088707" ID="ID_1543435810" MODIFIED="1710433093241" TEXT="Testabdeckung">
-<icon BUILTIN="flag-pink"/>
-</node>
+<node COLOR="#338800" CREATED="1710433088707" ID="ID_1543435810" MODIFIED="1710460887865" TEXT="Testabdeckung">
+<icon BUILTIN="button_ok"/>
 </node>
 </node>
 </node>
@@ -112165,8 +112165,8 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <icon BUILTIN="yes"/>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1710085571918" ID="ID_1847964804" MODIFIED="1710085586443" TEXT="per Unit-Test dokumentieren">
-<icon BUILTIN="flag-yellow"/>
+<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1710085571918" ID="ID_1847964804" MODIFIED="1710466417063" TEXT="per Unit-Test dokumentieren">
+<icon BUILTIN="pencil"/>
 <node CREATED="1710167567738" ID="ID_116953186" MODIFIED="1710168515030" TEXT="neue Test-Gruppe: 16calculation.tests">
 <node CREATED="1710167587540" ID="ID_1196727143" MODIFIED="1710167645967" TEXT="group=calculation"/>
 <node CREATED="1710167598409" ID="ID_498080750" MODIFIED="1710167615767" TEXT="Mathematik, aber auch Farbr&#xe4;ume und Signalverarbeitung"/>
@@ -112186,8 +112186,8 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node CREATED="1710170641389" ID="ID_39926847" MODIFIED="1710170645400" TEXT="auch bei Exception"/>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1710163662386" ID="ID_694159551" MODIFIED="1710170478456" TEXT="DataCSV_test">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1710163662386" ID="ID_694159551" MODIFIED="1710466414212" TEXT="DataCSV_test">
+<icon BUILTIN="button_ok"/>
 <node COLOR="#338800" CREATED="1710351225837" ID="ID_1756484657" MODIFIED="1710352395458" TEXT="simpleUsage">
 <icon BUILTIN="button_ok"/>
 <node COLOR="#435e98" CREATED="1710352396692" ID="ID_101637286" MODIFIED="1710352560707" TEXT="f&#xfc;hre hiermit Tabellen ohne File-Storage ein">
@@ -112195,6 +112195,15 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <icon BUILTIN="yes"/>
 </node>
 </node>
+<node COLOR="#338800" CREATED="1710460918482" ID="ID_85656633" MODIFIED="1710460921103" TEXT="verify_rowHandling">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#338800" CREATED="1710460928285" ID="ID_864668027" MODIFIED="1710460932163" TEXT="verify_CSV_Format">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#338800" CREATED="1710460938455" ID="ID_757574171" MODIFIED="1710466412661" TEXT="verify_persistentDataFile">
+<icon BUILTIN="button_ok"/>
+</node>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1710163672834" ID="ID_778295326" MODIFIED="1710170479867" TEXT="Statistic_test">
 <icon BUILTIN="flag-yellow"/>