morgane/EverShelf
1
0
Fork 0
Code Issues Pull Requests Actions 4 Packages Projects Releases Wiki Activity

fix: consumption predictions require >=5 txns, 7-day spread, and >=15% predicted consumption ratio

Browse Source
This commit is contained in:
dadaloop82
2026-05-12 14:31:24 +00:00
parent 2c34387592
commit 27ba41700f
1 changed files with 10 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
api/index.php
+10 -2
View File
@@ -2117,7 +2117,7 @@ function getConsumptionPredictions(PDO $db): void {
$txns->execute([$pid, $loc]); $txns->execute([$pid, $loc]);
$rows = $txns->fetchAll(PDO::FETCH_ASSOC); $rows = $txns->fetchAll(PDO::FETCH_ASSOC);
if (count($rows) < 3) continue; // Need at least 3 data points if (count($rows) < 5) continue; // Need at least 5 data points for a reliable rate
// Calculate average daily consumption // Calculate average daily consumption
$totalUsed = 0; $totalUsed = 0;
@@ -2125,7 +2125,9 @@ function getConsumptionPredictions(PDO $db): void {
$firstDate = strtotime($rows[0]['created_at']); $firstDate = strtotime($rows[0]['created_at']);
$lastDate = strtotime($rows[count($rows) - 1]['created_at']); $lastDate = strtotime($rows[count($rows) - 1]['created_at']);
$daySpan = max(1, ($lastDate - $firstDate) / 86400); $daySpan = ($lastDate - $firstDate) / 86400;
// If all transactions are clustered within a week, the rate is unreliable
if ($daySpan < 7) continue;
$dailyRate = $totalUsed / $daySpan; $dailyRate = $totalUsed / $daySpan;
if ($dailyRate < 0.01) continue; // negligible consumption if ($dailyRate < 0.01) continue; // negligible consumption
@@ -2160,6 +2162,12 @@ function getConsumptionPredictions(PDO $db): void {
$baselineQty = floatval($item['quantity']) + $usedSinceRestock; $baselineQty = floatval($item['quantity']) + $usedSinceRestock;
$daysSinceRestock = max(1, (time() - $restockDate) / 86400); $daysSinceRestock = max(1, (time() - $restockDate) / 86400);
// If the model predicts you should have consumed less than 15% of baseline
// in this period, the daily rate is too low to make reliable predictions:
// any single normal use will look like an anomaly. Skip it.
$predictedConsumption = $dailyRate * $daysSinceRestock;
if ($baselineQty > 0 && $predictedConsumption < $baselineQty * 0.15) continue;
// Predicted remaining qty = baseline - (daily rate * days since restock) // Predicted remaining qty = baseline - (daily rate * days since restock)
$expectedQty = max(0, $baselineQty - ($dailyRate * $daysSinceRestock)); $expectedQty = max(0, $baselineQty - ($dailyRate * $daysSinceRestock));
$actualQty = floatval($item['quantity']); $actualQty = floatval($item['quantity']);