feat: Integrate account_metrics collection with monthly refresh calendar

- Add account_metrics collection schema script
- Implement accountMetricsService with upsertAccountMetric, fetchAccountMetricsForMonth, calculateSalesBucket
- Extend accountsService with getLastSuccessfulAccountMetric
- Update AccountsPage to track daily metrics and display in calendar
- Calculate sales difference from last successful refresh
- Display refresh status and sales buckets in monthly calendar view
- Remove account_refresh_events dependency (use account_metrics only)

setup/create-account-metrics-collection.ps1

@@ -0,0 +1,86 @@
+# Appwrite schema script für account_metrics Collection
+# Erstellt die account_metrics Collection mit allen Attributen und Indexes
+#
+# Prereqs:
+#   appwrite login
+#   appwrite init project
+#
+# Run:
+#   pwsh .\create-account-metrics-collection.ps1 -DatabaseId "YOUR_DATABASE_ID"
+
+param(
+  [Parameter(Mandatory = $true)]
+  [string]$DatabaseId
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+# ---------------- CONFIG ----------------
+$T_ACCOUNT_METRICS = "account_metrics"
+
+# Minimal offene Defaults
+$PERMS_ANY_CRUD = @('create(any)','read(any)','update(any)','delete(any)')
+
+# ---------------- HELPERS ----------------
+function Try-Cmd {
+  param(
+    [Parameter(Mandatory = $true)]
+    [string[]]$Args
+  )
+
+  $cmd = "appwrite " + ($Args -join " ")
+  Write-Host ("+ " + $cmd)
+
+  try {
+    & appwrite @Args | Out-Host
+  } catch {
+    Write-Host ("  (ignored error) " + $_.Exception.Message)
+  }
+}
+
+function Create-Table {
+  param(
+    [Parameter(Mandatory = $true)][string]$TableId,
+    [Parameter(Mandatory = $true)][string]$Name
+  )
+
+  $argsList = @(
+    "tables-db","create-table",
+    "--database-id",$DatabaseId,
+    "--table-id",$TableId,
+    "--name",$Name,
+    "--row-security","false"
+  )
+  
+  Try-Cmd $argsList
+}
+
+# ---------------- CREATE TABLE ----------------
+Create-Table -TableId $T_ACCOUNT_METRICS -Name "account_metrics"
+
+# ---------------- ACCOUNT_METRICS COLUMNS ----------------
+# Required attributes
+Try-Cmd @("tables-db","create-string-column","--database-id",$DatabaseId,"--table-id",$T_ACCOUNT_METRICS,"--key","account_metrics_account_id","--size","64","--required","true","--array","false")
+Try-Cmd @("tables-db","create-string-column","--database-id",$DatabaseId,"--table-id",$T_ACCOUNT_METRICS,"--key","account_metrics_date","--size","10","--required","true","--array","false")
+Try-Cmd @("tables-db","create-string-column","--database-id",$DatabaseId,"--table-id",$T_ACCOUNT_METRICS,"--key","account_metrics_month","--size","7","--required","true","--array","false")
+
+# Refresh layer attributes
+Try-Cmd @("tables-db","create-boolean-column","--database-id",$DatabaseId,"--table-id",$T_ACCOUNT_METRICS,"--key","account_metrics_refreshed","--required","true","--array","false")
+Try-Cmd @("tables-db","create-enum-column","--database-id",$DatabaseId,"--table-id",$T_ACCOUNT_METRICS,"--key","account_metrics_refresh_status","--elements",'["success","failed"]',"--required","true","--array","false")
+Try-Cmd @("tables-db","create-datetime-column","--database-id",$DatabaseId,"--table-id",$T_ACCOUNT_METRICS,"--key","account_metrics_refreshed_at","--required","false","--array","false")
+
+# Sales layer attributes
+Try-Cmd @("tables-db","create-integer-column","--database-id",$DatabaseId,"--table-id",$T_ACCOUNT_METRICS,"--key","account_metrics_sales_count","--required","false","--array","false")
+Try-Cmd @("tables-db","create-string-column","--database-id",$DatabaseId,"--table-id",$T_ACCOUNT_METRICS,"--key","account_metrics_sales_bucket","--size","10","--required","false","--array","false")
+
+# ---------------- ACCOUNT_METRICS INDEXES ----------------
+# Unique index: ensures one doc per account per day
+Try-Cmd @("tables-db","create-index","--database-id",$DatabaseId,"--table-id",$T_ACCOUNT_METRICS,"--key","uniq_account_date","--type","unique","--columns","account_metrics_account_id","account_metrics_date")
+
+# Index for month queries
+Try-Cmd @("tables-db","create-index","--database-id",$DatabaseId,"--table-id",$T_ACCOUNT_METRICS,"--key","idx_account_month","--type","key","--columns","account_metrics_account_id","account_metrics_month")
+
+Write-Host ""
+Write-Host "account_metrics Collection erstellt!"
+Write-Host ""