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backend/app/Models/Assignment.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Assignment extends Model
+{
+    protected $fillable = ['tenant_id', 'template_id', 'directory_group_id', 'priority'];
+
+    public function template(): BelongsTo { return $this->belongsTo(Template::class); }
+    public function group(): BelongsTo { return $this->belongsTo(DirectoryGroup::class, 'directory_group_id'); }
+}

backend/app/Models/AuditLog.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class AuditLog extends Model
+{
+    public const UPDATED_AT = null;
+
+    protected $guarded = ['id'];
+
+    protected function casts(): array
+    {
+        return ['changes' => 'array'];
+    }
+
+    public static function record(string $actorType, ?string $actor, string $action, ?Model $subject = null, array $changes = [], ?int $tenantId = null): self
+    {
+        return static::create([
+            'tenant_id' => $tenantId ?? ($subject?->tenant_id ?? null),
+            'actor_type' => $actorType,
+            'actor' => $actor,
+            'action' => $action,
+            'subject_type' => $subject ? $subject::class : null,
+            'subject_id' => $subject?->getKey(),
+            'changes' => $changes ?: null,
+            'ip' => request()?->ip(),
+        ]);
+    }
+}

backend/app/Models/Campaign.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+
+class Campaign extends Model
+{
+    protected $guarded = ['id'];
+
+    protected function casts(): array
+    {
+        return ['starts_at' => 'datetime', 'ends_at' => 'datetime', 'active' => 'boolean'];
+    }
+
+    public function groups(): BelongsToMany
+    {
+        return $this->belongsToMany(DirectoryGroup::class, 'campaign_group');
+    }
+
+    public function scopeRunning(Builder $q): Builder
+    {
+        return $q->where('active', true)->where('starts_at', '<=', now())->where('ends_at', '>=', now());
+    }
+}

backend/app/Models/DirectoryGroup.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+
+class DirectoryGroup extends Model
+{
+    protected $fillable = ['tenant_id', 'entra_oid', 'display_name', 'synced_at'];
+
+    protected function casts(): array
+    {
+        return ['synced_at' => 'datetime'];
+    }
+
+    public function tenant(): BelongsTo { return $this->belongsTo(Tenant::class); }
+
+    public function members(): BelongsToMany
+    {
+        return $this->belongsToMany(DirectoryUser::class, 'group_members');
+    }
+}

backend/app/Models/DirectoryUser.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\HasOne;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+/** Copie locale d'un utilisateur Entra (alimentée par la synchro Graph, jamais modifiée à la main). */
+class DirectoryUser extends Model
+{
+    use SoftDeletes;
+
+    protected $guarded = ['id'];
+
+    protected function casts(): array
+    {
+        return ['account_enabled' => 'boolean', 'synced_at' => 'datetime'];
+    }
+
+    public function tenant(): BelongsTo { return $this->belongsTo(Tenant::class); }
+
+    public function groups(): BelongsToMany
+    {
+        return $this->belongsToMany(DirectoryGroup::class, 'group_members');
+    }
+
+    public function overrides(): HasMany { return $this->hasMany(UserOverride::class); }
+    public function preference(): HasOne { return $this->hasOne(UserPreference::class); }
+}

backend/app/Models/EditableField.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class EditableField extends Model
+{
+    protected $fillable = ['tenant_id', 'field', 'label', 'enabled', 'validation_rule'];
+
+    protected function casts(): array
+    {
+        return ['enabled' => 'boolean'];
+    }
+}

backend/app/Models/SharedMailbox.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class SharedMailbox extends Model
+{
+    protected $fillable = ['tenant_id', 'address', 'display_name', 'template_id', 'include_sender'];
+
+    protected function casts(): array
+    {
+        return ['include_sender' => 'boolean'];
+    }
+
+    public function template(): BelongsTo { return $this->belongsTo(Template::class); }
+}

backend/app/Models/Template.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Template extends Model
+{
+    protected $guarded = ['id'];
+
+    protected function casts(): array
+    {
+        return ['is_default' => 'boolean', 'editor_state' => 'array', 'published_at' => 'datetime'];
+    }
+
+    public function tenant(): BelongsTo { return $this->belongsTo(Tenant::class); }
+    public function versions(): HasMany { return $this->hasMany(TemplateVersion::class); }
+    public function assignments(): HasMany { return $this->hasMany(Assignment::class); }
+
+    /** Publie le brouillon : copie vers le contenu servi + nouvelle version d'historique. */
+    public function publish(?User $by = null): void
+    {
+        $this->html_full = $this->draft_html_full ?? $this->html_full;
+        $this->html_short = $this->draft_html_short ?? $this->html_short;
+        $this->published_version++;
+        $this->published_at = now();
+        $this->save();
+
+        $this->versions()->create([
+            'version' => $this->published_version,
+            'html_full' => $this->html_full,
+            'html_short' => $this->html_short,
+            'published_by' => $by?->id,
+        ]);
+    }
+}

backend/app/Models/TemplateVersion.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class TemplateVersion extends Model
+{
+    protected $guarded = ['id'];
+
+    public function template(): BelongsTo { return $this->belongsTo(Template::class); }
+    public function publisher(): BelongsTo { return $this->belongsTo(User::class, 'published_by'); }
+}

backend/app/Models/Tenant.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Tenant extends Model
+{
+    protected $fillable = ['name', 'entra_tenant_id', 'active', 'users_delta_link', 'last_sync_at', 'last_sync_status'];
+
+    protected $hidden = ['users_delta_link'];
+
+    protected function casts(): array
+    {
+        return ['active' => 'boolean', 'last_sync_at' => 'datetime'];
+    }
+
+    public function users(): HasMany { return $this->hasMany(DirectoryUser::class); }
+    public function groups(): HasMany { return $this->hasMany(DirectoryGroup::class); }
+    public function templates(): HasMany { return $this->hasMany(Template::class); }
+    public function assignments(): HasMany { return $this->hasMany(Assignment::class); }
+    public function campaigns(): HasMany { return $this->hasMany(Campaign::class); }
+    public function sharedMailboxes(): HasMany { return $this->hasMany(SharedMailbox::class); }
+    public function editableFields(): HasMany { return $this->hasMany(EditableField::class); }
+}

backend/app/Models/User.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Foundation\Auth\User as Authenticatable;
+use Illuminate\Notifications\Notifiable;
+
+/** Compte du back-office (connexion SSO Entra uniquement). */
+class User extends Authenticatable
+{
+    use HasFactory, Notifiable;
+
+    public const ROLE_RANK = ['editor' => 1, 'admin' => 2, 'superadmin' => 3];
+
+    protected $fillable = ['name', 'email', 'tenant_id', 'entra_oid', 'role'];
+
+    protected $hidden = ['password', 'remember_token'];
+
+    public function tenant(): BelongsTo { return $this->belongsTo(Tenant::class); }
+
+    public function hasRole(string $minimum): bool
+    {
+        return (self::ROLE_RANK[$this->role] ?? 0) >= (self::ROLE_RANK[$minimum] ?? PHP_INT_MAX);
+    }
+}

backend/app/Models/UserOverride.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class UserOverride extends Model
+{
+    protected $fillable = ['directory_user_id', 'field', 'value'];
+
+    public function user(): BelongsTo { return $this->belongsTo(DirectoryUser::class, 'directory_user_id'); }
+}

backend/app/Models/UserPreference.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class UserPreference extends Model
+{
+    protected $fillable = ['directory_user_id', 'reply_variant'];
+}