feat(client,setting): complete Phase 2 with partitioned client_follow_logs

- apps/client (11 models): Client, ClientContact, ClientRequirement,
  ClientSchoolPreference, ClientFollowLog (partitioned),
  ClientFollowLogAttachment, ClientViewing, ClientPropertyMatch,
  ClientStatusLog, ClientFavoriteFolder, ClientFolderItem
- apps/client/0002 RunSQL: PARTITION BY RANGE(created_at) for
  client_follow_logs + monthly partitions + default; triggers
  update_client_last_follow + update_client_viewing_progress;
  partial unique index on client_no WHERE deleted_at IS NULL
- apps/setting (4 models): LookupGroup, LookupItem, TenantSetting,
  FieldRequirementRule (tenant schema only per spec)

manage.py check green; all 9 Phase 2 apps complete.

apps/client/migrations/0002_partitions_and_triggers.py

@@ -0,0 +1,99 @@
+from django.db import migrations
+
+CREATE_CLIENT_FOLLOW_LOGS = """
+CREATE TABLE client_follow_logs (
+    id              UUID NOT NULL DEFAULT gen_random_uuid(),
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    client_id       UUID NOT NULL REFERENCES clients(id) ON DELETE CASCADE,
+    log_type        VARCHAR(30) NOT NULL
+                    CHECK (log_type IN ('written','modified','sensitive_view',
+                                       'other','system')),
+    purpose         VARCHAR(50),
+    content         TEXT,
+    log_tag         VARCHAR(50),
+    change_detail   JSONB,
+    is_public       BOOLEAN NOT NULL DEFAULT TRUE,
+    is_deletable    BOOLEAN NOT NULL DEFAULT TRUE,
+    operator_id     UUID REFERENCES staff(id) ON DELETE SET NULL,
+    operator_snapshot JSONB,
+    deleted_at      TIMESTAMPTZ,
+    PRIMARY KEY (id, created_at)
+) PARTITION BY RANGE (created_at);
+
+CREATE TABLE client_follow_logs_2026_04 PARTITION OF client_follow_logs
+    FOR VALUES FROM ('2026-04-01') TO ('2026-05-01');
+CREATE TABLE client_follow_logs_2026_05 PARTITION OF client_follow_logs
+    FOR VALUES FROM ('2026-05-01') TO ('2026-06-01');
+CREATE TABLE client_follow_logs_default PARTITION OF client_follow_logs DEFAULT;
+
+CREATE INDEX idx_cfl_client_time ON client_follow_logs(client_id, created_at DESC)
+    WHERE deleted_at IS NULL;
+CREATE INDEX idx_cfl_type ON client_follow_logs(client_id, log_type, created_at DESC)
+    WHERE deleted_at IS NULL;
+CREATE INDEX idx_cfl_operator ON client_follow_logs(operator_id, created_at DESC)
+    WHERE deleted_at IS NULL;
+CREATE INDEX idx_cfl_sensitive ON client_follow_logs(client_id, created_at DESC)
+    WHERE log_type = 'sensitive_view';
+"""
+
+DROP_CLIENT_FOLLOW_LOGS = "DROP TABLE IF EXISTS client_follow_logs CASCADE;"
+
+CREATE_TRIGGERS = """
+CREATE OR REPLACE FUNCTION update_client_last_follow()
+RETURNS TRIGGER AS $$
+BEGIN
+    IF NEW.log_type = 'written' THEN
+        UPDATE clients
+        SET last_follow_at = NEW.created_at,
+            last_active_at = NEW.created_at,
+            updated_at = NOW()
+        WHERE id = NEW.client_id;
+    END IF;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trg_client_last_follow
+    AFTER INSERT ON client_follow_logs
+    FOR EACH ROW EXECUTE FUNCTION update_client_last_follow();
+
+CREATE OR REPLACE FUNCTION update_client_viewing_progress()
+RETURNS TRIGGER AS $$
+BEGIN
+    UPDATE clients
+    SET updated_at = NOW()
+    WHERE id = NEW.client_id;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trg_client_viewing_progress
+    AFTER INSERT ON client_viewings
+    FOR EACH ROW EXECUTE FUNCTION update_client_viewing_progress();
+"""
+
+DROP_TRIGGERS = """
+DROP TRIGGER IF EXISTS trg_client_viewing_progress ON client_viewings;
+DROP FUNCTION IF EXISTS update_client_viewing_progress();
+DROP TRIGGER IF EXISTS trg_client_last_follow ON client_follow_logs;
+DROP FUNCTION IF EXISTS update_client_last_follow();
+"""
+
+CREATE_UNIQUE_CLIENT_NO = """
+CREATE UNIQUE INDEX idx_clients_client_no_active ON clients(client_no)
+    WHERE deleted_at IS NULL;
+"""
+
+DROP_UNIQUE_CLIENT_NO = "DROP INDEX IF EXISTS idx_clients_client_no_active;"
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("fonrey_client", "0001_initial"),
+    ]
+
+    operations = [
+        migrations.RunSQL(CREATE_CLIENT_FOLLOW_LOGS, reverse_sql=DROP_CLIENT_FOLLOW_LOGS),
+        migrations.RunSQL(CREATE_TRIGGERS, reverse_sql=DROP_TRIGGERS),
+        migrations.RunSQL(CREATE_UNIQUE_CLIENT_NO, reverse_sql=DROP_UNIQUE_CLIENT_NO),
+    ]