Add PostgreSQL analytics dashboard prototype and realistic sample data

mockups/start-postgres.ps1

@@ -0,0 +1,14 @@
+$ErrorActionPreference = 'Stop'
+$repoRoot = Split-Path $PSScriptRoot -Parent
+if ($env:DATABASE_URL) { return }
+$localRoot = Join-Path $repoRoot '.local'
+$pgCtl = Join-Path $localRoot 'pgsql\bin\pg_ctl.exe'
+$dataPath = Join-Path $localRoot 'pgdata'
+if (!(Test-Path -LiteralPath $pgCtl)) { throw 'Run mockups/setup-database.ps1 first.' }
+& $pgCtl status -D $dataPath *> $null
+if ($LASTEXITCODE -ne 0) {
+    $argsForPg = @('start','-D',('"'+$dataPath+'"'),'-l',('"'+(Join-Path $localRoot 'postgres.log')+'"'),'-o','"-h 127.0.0.1 -p 55432"','-w','-t','30')
+    $startResult = Start-Process -FilePath $pgCtl -ArgumentList $argsForPg -WindowStyle Hidden -PassThru
+    if (!$startResult.WaitForExit(35000)) { throw 'PostgreSQL start timed out. See .local/postgres.log.' }
+    if ($startResult.ExitCode -ne 0) { throw 'PostgreSQL could not start. See .local/postgres.log.' }
+}