diff --git a/internal/api/handler/contact_detail.go b/internal/api/handler/contact_detail.go
new file mode 100644
index 00000000..dcb208ba
--- /dev/null
+++ b/internal/api/handler/contact_detail.go
@@ -0,0 +1,127 @@
+package handler
+
+import (
+	"net/http"
+	"strconv"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+	"github.com/warmbly/warmbly/internal/api/middleware"
+	"github.com/warmbly/warmbly/internal/errx"
+)
+
+// GetContact returns the hydrated contact 360 payload. Used by the
+// slide-over on open to render the Overview / engagement-summary tab
+// in a single round-trip. Organization is optional — when the caller
+// has none selected we still return core + engagement, just without
+// org-scoped suppression / complaint counts.
+func (h *Handler) GetContact(c *gin.Context) {
+	userID, err := middleware.GetUserUUID(c)
+	if err != nil {
+		errx.Handle(c, errx.ErrAuth)
+		return
+	}
+	contactID, err := uuid.Parse(c.Param("id"))
+	if err != nil {
+		errx.Handle(c, errx.ErrUuid)
+		return
+	}
+
+	orgID := middleware.GetOrganizationID(c)
+
+	detail, xerr := h.ContactService.GetDetail(c.Request.Context(), userID, orgID, contactID)
+	if xerr != nil {
+		errx.Handle(c, xerr)
+		return
+	}
+
+	c.JSON(http.StatusOK, detail)
+}
+
+// ListContactEmails returns one row per email we sent (or tried to
+// send) to the contact. Cursor pagination keyed on the task ID.
+func (h *Handler) ListContactEmails(c *gin.Context) {
+	userID, err := middleware.GetUserUUID(c)
+	if err != nil {
+		errx.Handle(c, errx.ErrAuth)
+		return
+	}
+	contactID, err := uuid.Parse(c.Param("id"))
+	if err != nil {
+		errx.Handle(c, errx.ErrUuid)
+		return
+	}
+
+	limit := 50
+	if l, err := strconv.Atoi(c.Query("limit")); err == nil && l > 0 && l <= 200 {
+		limit = l
+	}
+
+	// The cursor for sent-email pagination is the (created_at, task_id)
+	// pair from the last row of the previous page. Both must be present
+	// or we skip the cursor and start fresh.
+	var beforeAt *time.Time
+	var beforeID *uuid.UUID
+	if v := c.Query("before_at"); v != "" {
+		if t, perr := time.Parse(time.RFC3339Nano, v); perr == nil {
+			beforeAt = &t
+		}
+	}
+	if v := c.Query("before_id"); v != "" {
+		if id, perr := uuid.Parse(v); perr == nil {
+			beforeID = &id
+		}
+	}
+
+	res, xerr := h.ContactService.ListSentEmails(c.Request.Context(), userID, contactID, limit, beforeAt, beforeID)
+	if xerr != nil {
+		errx.Handle(c, xerr)
+		return
+	}
+
+	c.JSON(http.StatusOK, res)
+}
+
+// ListContactTimeline returns the merged activity feed for a contact.
+// Suppression / deliverability / reply / note events are org-scoped
+// and require a selected organization; we 400 if there isn't one to
+// avoid silently returning a misleadingly thin feed.
+func (h *Handler) ListContactTimeline(c *gin.Context) {
+	userID, err := middleware.GetUserUUID(c)
+	if err != nil {
+		errx.Handle(c, errx.ErrAuth)
+		return
+	}
+	contactID, err := uuid.Parse(c.Param("id"))
+	if err != nil {
+		errx.Handle(c, errx.ErrUuid)
+		return
+	}
+
+	orgID := middleware.GetOrganizationID(c)
+	if orgID == nil {
+		errx.Handle(c, errx.New(errx.BadRequest, "no organization selected"))
+		return
+	}
+
+	limit := 50
+	if l, err := strconv.Atoi(c.Query("limit")); err == nil && l > 0 && l <= 200 {
+		limit = l
+	}
+
+	var before *time.Time
+	if v := c.Query("before"); v != "" {
+		if t, perr := time.Parse(time.RFC3339Nano, v); perr == nil {
+			before = &t
+		}
+	}
+
+	res, xerr := h.ContactService.ListTimeline(c.Request.Context(), userID, orgID, contactID, limit, before)
+	if xerr != nil {
+		errx.Handle(c, xerr)
+		return
+	}
+
+	c.JSON(http.StatusOK, res)
+}
diff --git a/internal/api/routes.go b/internal/api/routes.go
index a211099d..b6015f75 100644
--- a/internal/api/routes.go
+++ b/internal/api/routes.go
@@ -179,6 +179,12 @@ func Run(
 			contacts.PATCH("/:id", m.RequireAccess(models.PermManageContacts, models.APIPermWriteContacts), h.UpdateContact)
 			contacts.DELETE("/:id", m.RequireAccess(models.PermManageContacts, models.APIPermWriteContacts), h.DeleteContact)
 
+			// Contact 360 view: hydrated detail, every email sent to
+			// the contact, and the merged activity timeline.
+			contacts.GET("/:id", m.RequireAccess(models.PermViewContacts, models.APIPermReadContacts), h.GetContact)
+			contacts.GET("/:id/emails", m.RequireAccess(models.PermViewContacts, models.APIPermReadContacts), h.ListContactEmails)
+			contacts.GET("/:id/timeline", m.RequireAccess(models.PermViewContacts, models.APIPermReadContacts), h.ListContactTimeline)
+
 			// CRM: Notes & Activities (under contacts)
 			contacts.GET("/:id/notes", m.RequireAccess(models.PermViewContacts, models.APIPermReadContacts), h.ListContactNotes)
 			contacts.POST("/:id/notes", m.RequireAccess(models.PermManageContacts, models.APIPermWriteContacts), h.CreateContactNote)
diff --git a/internal/app/contact/handler.go b/internal/app/contact/handler.go
index fddcd705..6e22bf4a 100644
--- a/internal/app/contact/handler.go
+++ b/internal/app/contact/handler.go
@@ -2,6 +2,7 @@ package contact
 
 import (
 	"context"
+	"time"
 
 	"github.com/google/uuid"
 	"github.com/warmbly/warmbly/internal/errx"
@@ -66,3 +67,15 @@ func (s *contactService) BulkDelete(ctx context.Context, userID string, contactI
 func (s *contactService) Delete(ctx context.Context, userID string, contactID string) *errx.Error {
 	return s.contactRepository.Delete(ctx, userID, contactID)
 }
+
+func (s *contactService) GetDetail(ctx context.Context, userID uuid.UUID, orgID *uuid.UUID, contactID uuid.UUID) (*models.ContactDetail, *errx.Error) {
+	return s.contactRepository.GetDetail(ctx, userID, orgID, contactID)
+}
+
+func (s *contactService) ListSentEmails(ctx context.Context, userID, contactID uuid.UUID, limit int, beforeSentAt *time.Time, beforeTaskID *uuid.UUID) (*models.ContactSentEmailsResult, *errx.Error) {
+	return s.contactRepository.ListSentEmails(ctx, userID, contactID, limit, beforeSentAt, beforeTaskID)
+}
+
+func (s *contactService) ListTimeline(ctx context.Context, userID uuid.UUID, orgID *uuid.UUID, contactID uuid.UUID, limit int, before *time.Time) (*models.ContactTimelineResult, *errx.Error) {
+	return s.contactRepository.ListTimeline(ctx, userID, orgID, contactID, limit, before)
+}
diff --git a/internal/app/contact/service.go b/internal/app/contact/service.go
index 8cea4df0..06c3d1ba 100644
--- a/internal/app/contact/service.go
+++ b/internal/app/contact/service.go
@@ -3,7 +3,9 @@ package contact
 import (
 	"context"
 	"io"
+	"time"
 
+	"github.com/google/uuid"
 	"github.com/warmbly/warmbly/internal/errx"
 	"github.com/warmbly/warmbly/internal/models"
 	"github.com/warmbly/warmbly/internal/repository"
@@ -30,6 +32,18 @@ type ContactService interface {
 	// and performs the upsert / skip / dedup work. Returns per-row
 	// result counts plus a list of rows that failed (with reasons).
 	ImportCommit(ctx context.Context, userID string, file io.Reader, filename string, opts *models.ContactImportCommit) (*models.ContactImportResult, *errx.Error)
+
+	// GetDetail returns the 360 read model used by the contact
+	// slide-over: hydrated contact + engagement summary + suppression.
+	GetDetail(ctx context.Context, userID uuid.UUID, orgID *uuid.UUID, contactID uuid.UUID) (*models.ContactDetail, *errx.Error)
+
+	// ListSentEmails enumerates every send (or attempted send) we made
+	// to the contact, newest first.
+	ListSentEmails(ctx context.Context, userID, contactID uuid.UUID, limit int, beforeSentAt *time.Time, beforeTaskID *uuid.UUID) (*models.ContactSentEmailsResult, *errx.Error)
+
+	// ListTimeline returns a merged, reverse-chronological feed of all
+	// engagement + CRM events for the contact.
+	ListTimeline(ctx context.Context, userID uuid.UUID, orgID *uuid.UUID, contactID uuid.UUID, limit int, before *time.Time) (*models.ContactTimelineResult, *errx.Error)
 }
 
 type contactService struct {
diff --git a/internal/models/contact.go b/internal/models/contact.go
index f8626b2d..8190d8c2 100644
--- a/internal/models/contact.go
+++ b/internal/models/contact.go
@@ -39,6 +39,133 @@ type ContactsResult struct {
 	Pagination Pagination `json:"pagination"`
 }
 
+// ContactEngagement summarises every email touchpoint we have for a
+// single contact. It's denormalised on read so the contact 360 view
+// can render counts and "last X" timestamps in a single round-trip.
+type ContactEngagement struct {
+	TotalSent     int `json:"total_sent"`
+	TotalOpened   int `json:"total_opened"`
+	TotalClicked  int `json:"total_clicked"`
+	TotalReplied  int `json:"total_replied"`
+	TotalBounced  int `json:"total_bounced"`
+	TotalComplained int `json:"total_complained"`
+
+	LastSentAt    *time.Time `json:"last_sent_at,omitempty"`
+	LastOpenedAt  *time.Time `json:"last_opened_at,omitempty"`
+	LastClickedAt *time.Time `json:"last_clicked_at,omitempty"`
+	LastRepliedAt *time.Time `json:"last_replied_at,omitempty"`
+	LastBouncedAt *time.Time `json:"last_bounced_at,omitempty"`
+}
+
+// ContactSuppression mirrors a row from suppressed_recipients for the
+// contact's email. Null on the wire when the contact is not suppressed.
+type ContactSuppression struct {
+	Reason    string     `json:"reason"`
+	Source    string     `json:"source"` // bounce | complaint | unsubscribe
+	ExpiresAt *time.Time `json:"expires_at,omitempty"`
+	CreatedAt time.Time  `json:"created_at"`
+}
+
+// ContactDetail is the hydrated read model returned by GET /contacts/:id.
+// It bundles everything the slide-over needs in one payload so the UI
+// doesn't have to fan out a half-dozen requests on open.
+type ContactDetail struct {
+	Contact
+	Engagement  ContactEngagement   `json:"engagement"`
+	Suppression *ContactSuppression `json:"suppression,omitempty"`
+}
+
+// ContactSentEmail is one row in the "Emails sent to this contact"
+// list. Each row corresponds to a single delivered (or attempted)
+// task. Engagement timestamps come from campaign_contact_progress
+// when present; some legacy rows may have nil progress.
+type ContactSentEmail struct {
+	TaskID       uuid.UUID `json:"task_id"`
+	Status       string    `json:"status"`
+	MessageID    string    `json:"message_id"`
+	Subject      string    `json:"subject"`
+	SentAt       time.Time `json:"sent_at"`
+
+	// Sender mailbox
+	EmailAccountID    *uuid.UUID `json:"email_account_id,omitempty"`
+	EmailAccountEmail *string    `json:"email_account_email,omitempty"`
+	EmailAccountName  *string    `json:"email_account_name,omitempty"`
+
+	// Campaign + sequence context
+	CampaignID   *uuid.UUID `json:"campaign_id,omitempty"`
+	CampaignName *string    `json:"campaign_name,omitempty"`
+	SequenceID   *uuid.UUID `json:"sequence_id,omitempty"`
+	SequenceName *string    `json:"sequence_name,omitempty"`
+
+	// Engagement (from campaign_contact_progress, may be nil).
+	OpenedAt  *time.Time `json:"opened_at,omitempty"`
+	ClickedAt *time.Time `json:"clicked_at,omitempty"`
+	RepliedAt *time.Time `json:"replied_at,omitempty"`
+	BouncedAt *time.Time `json:"bounced_at,omitempty"`
+}
+
+type ContactSentEmailsResult struct {
+	Data       []ContactSentEmail `json:"data"`
+	Pagination Pagination         `json:"pagination"`
+}
+
+// ContactTimelineEventType is a closed enum so the frontend can pick
+// the right icon / colour without parsing free text.
+type ContactTimelineEventType string
+
+const (
+	TimelineEmailSent      ContactTimelineEventType = "email_sent"
+	TimelineEmailOpened    ContactTimelineEventType = "email_opened"
+	TimelineEmailClicked   ContactTimelineEventType = "email_clicked"
+	TimelineEmailReplied   ContactTimelineEventType = "email_replied"
+	TimelineEmailBounced   ContactTimelineEventType = "email_bounced"
+	TimelineReplyReceived  ContactTimelineEventType = "reply_received"
+	TimelineDeliverability ContactTimelineEventType = "deliverability"
+	TimelineSuppressed     ContactTimelineEventType = "suppressed"
+	TimelineNote           ContactTimelineEventType = "note"
+)
+
+// ContactTimelineEvent is one entry in the merged activity feed. The
+// optional fields are tagged with omitempty so the JSON stays compact
+// for event types that don't carry that data.
+type ContactTimelineEvent struct {
+	Type ContactTimelineEventType `json:"type"`
+	At   time.Time                `json:"at"`
+
+	// Mailbox sender (email_sent / opened / clicked / replied / bounced).
+	EmailAccountID    *uuid.UUID `json:"email_account_id,omitempty"`
+	EmailAccountEmail *string    `json:"email_account_email,omitempty"`
+	EmailAccountName  *string    `json:"email_account_name,omitempty"`
+
+	// Campaign / sequence linkage. Optional because notes, suppression,
+	// and out-of-campaign reply intents don't always have one.
+	CampaignID   *uuid.UUID `json:"campaign_id,omitempty"`
+	CampaignName *string    `json:"campaign_name,omitempty"`
+	SequenceID   *uuid.UUID `json:"sequence_id,omitempty"`
+	SequenceName *string    `json:"sequence_name,omitempty"`
+
+	// Task linkage for engagement events.
+	TaskID  *uuid.UUID `json:"task_id,omitempty"`
+	Subject *string    `json:"subject,omitempty"`
+
+	// Type-specific.
+	Reason   *string `json:"reason,omitempty"`   // deliverability / suppression
+	Source   *string `json:"source,omitempty"`   // suppression: bounce/complaint/unsubscribe
+	Provider *string `json:"provider,omitempty"` // deliverability provider
+	Intent   *string `json:"intent,omitempty"`   // reply_intent classification
+	Content  *string `json:"content,omitempty"`  // note body
+
+	// Author (notes).
+	UserID *uuid.UUID `json:"user_id,omitempty"`
+}
+
+type ContactTimelineResult struct {
+	Data []ContactTimelineEvent `json:"data"`
+	// True if we hit the per-call cap and the caller should paginate
+	// via the `before` query param.
+	HasMore bool `json:"has_more"`
+}
+
 type UpdateContact struct {
 	FirstName        *string            `json:"first_name"`
 	LastName         *string            `json:"last_name"`
diff --git a/internal/repository/pg_contact.go b/internal/repository/pg_contact.go
index 1d463bd0..c621b661 100644
--- a/internal/repository/pg_contact.go
+++ b/internal/repository/pg_contact.go
@@ -4,7 +4,9 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"sort"
 	"strings"
+	"time"
 
 	"github.com/getsentry/sentry-go"
 	"github.com/google/uuid"
@@ -30,6 +32,12 @@ type ContactRepository interface {
 	BulkDelete(ctx context.Context, userID string, contactIDs []string) *errx.Error
 	Delete(ctx context.Context, userID string, contactID string) *errx.Error
 	GetContactCount(ctx context.Context, userID string) (int, *errx.Error)
+
+	// 360 view read paths. orgID is optional — when nil, the suppression
+	// + deliverability + reply joins are skipped (they're org-scoped).
+	GetDetail(ctx context.Context, userID uuid.UUID, orgID *uuid.UUID, contactID uuid.UUID) (*models.ContactDetail, *errx.Error)
+	ListSentEmails(ctx context.Context, userID, contactID uuid.UUID, limit int, beforeSentAt *time.Time, beforeTaskID *uuid.UUID) (*models.ContactSentEmailsResult, *errx.Error)
+	ListTimeline(ctx context.Context, userID uuid.UUID, orgID *uuid.UUID, contactID uuid.UUID, limit int, before *time.Time) (*models.ContactTimelineResult, *errx.Error)
 }
 
 type contactRepository struct {
@@ -1483,3 +1491,508 @@ func (r *contactRepository) GetContactCount(ctx context.Context, userID string)
 	}
 	return count, nil
 }
+
+// GetDetail loads the contact 360 payload: core fields + categories +
+// campaigns + engagement counts + suppression. Single round-trip via a
+// few separate queries (one main select + a couple of small aggregates)
+// so the query plans stay simple and cheap to reason about.
+//
+// orgID is optional because not every caller has an org context (e.g.
+// an API key scoped to a user without a selected org). When nil we
+// skip the org-scoped joins (suppression, deliverability) and return
+// zeros for those fields.
+func (r *contactRepository) GetDetail(ctx context.Context, userID uuid.UUID, orgID *uuid.UUID, contactID uuid.UUID) (*models.ContactDetail, *errx.Error) {
+	// 1. Core contact + categories + campaigns. Same shape as Search
+	//    so the UI gets identical fields back.
+	var detail models.ContactDetail
+	var campaignsJSON, categoriesJSON []byte
+	mainQuery := `
+		SELECT
+			c.id, c.first_name, c.last_name, c.email, c.company, c.phone,
+			c.custom_fields, c.subscribed, c.updated_at, c.created_at,
+			COALESCE(
+				(
+					SELECT json_agg(json_build_object('id', cam.id, 'name', cam.name))
+					FROM   campaign_leads cl
+					JOIN   campaigns cam ON cam.id = cl.campaign_id
+					WHERE  cl.contact_id = c.id AND cam.user_id = $1
+				), '[]'::json
+			) AS campaigns,
+			COALESCE(
+				(
+					SELECT json_agg(json_build_object('id', cat.id, 'title', cat.title, 'color', cat.color) ORDER BY cat.position ASC, cat.title ASC)
+					FROM   contact_categories cc
+					JOIN   categories cat ON cat.id = cc.category_id
+					WHERE  cc.contact_id = c.id AND cat.user_id = $1
+				), '[]'::json
+			) AS categories
+		FROM contacts c
+		WHERE c.id = $2 AND c.user_id = $1
+	`
+	err := r.DB.QueryRow(ctx, mainQuery, userID, contactID).Scan(
+		&detail.ID, &detail.FirstName, &detail.LastName, &detail.Email,
+		&detail.Company, &detail.Phone, &detail.CustomFields, &detail.Subscribed,
+		&detail.UpdatedAt, &detail.CreatedAt, &campaignsJSON, &categoriesJSON,
+	)
+	if err != nil {
+		if err == pgx.ErrNoRows {
+			return nil, errx.ErrNotFound
+		}
+		db.CaptureError(err, mainQuery, []any{userID, contactID}, "GetDetail main")
+		return nil, errx.InternalError()
+	}
+	if detail.CustomFields == nil {
+		detail.CustomFields = map[string]string{}
+	}
+	detail.Campaigns = []models.MiniCampaign{}
+	if len(campaignsJSON) > 0 {
+		var raw []struct {
+			ID   string `json:"id"`
+			Name string `json:"name"`
+		}
+		if err := json.Unmarshal(campaignsJSON, &raw); err != nil {
+			sentry.CaptureException(err)
+			return nil, errx.InternalError()
+		}
+		detail.Campaigns = make([]models.MiniCampaign, len(raw))
+		for i, m := range raw {
+			detail.Campaigns[i] = models.MiniCampaign{ID: m.ID, Name: m.Name}
+		}
+	}
+	detail.Categories = []models.MiniCategory{}
+	if len(categoriesJSON) > 0 {
+		if err := json.Unmarshal(categoriesJSON, &detail.Categories); err != nil {
+			sentry.CaptureException(err)
+			return nil, errx.InternalError()
+		}
+	}
+
+	// 2. Engagement aggregates. campaign_contact_progress is the canonical
+	//    sent/opened/clicked/replied/bounced ledger keyed by (campaign,
+	//    contact, sequence). Counts come from non-null timestamp columns,
+	//    "last X" comes from MAX() of each.
+	engQuery := `
+		SELECT
+			COUNT(*) FILTER (WHERE sent_at    IS NOT NULL) AS sent,
+			COUNT(*) FILTER (WHERE opened_at  IS NOT NULL) AS opened,
+			COUNT(*) FILTER (WHERE clicked_at IS NOT NULL) AS clicked,
+			COUNT(*) FILTER (WHERE replied_at IS NOT NULL) AS replied,
+			COUNT(*) FILTER (WHERE bounced_at IS NOT NULL) AS bounced,
+			MAX(sent_at), MAX(opened_at), MAX(clicked_at), MAX(replied_at), MAX(bounced_at)
+		FROM campaign_contact_progress
+		WHERE contact_id = $1
+	`
+	if err := r.DB.QueryRow(ctx, engQuery, contactID).Scan(
+		&detail.Engagement.TotalSent, &detail.Engagement.TotalOpened,
+		&detail.Engagement.TotalClicked, &detail.Engagement.TotalReplied,
+		&detail.Engagement.TotalBounced,
+		&detail.Engagement.LastSentAt, &detail.Engagement.LastOpenedAt,
+		&detail.Engagement.LastClickedAt, &detail.Engagement.LastRepliedAt,
+		&detail.Engagement.LastBouncedAt,
+	); err != nil {
+		db.CaptureError(err, engQuery, []any{contactID}, "GetDetail engagement")
+		return nil, errx.InternalError()
+	}
+
+	// 3. Org-scoped extras. Only run when we have an org id.
+	if orgID != nil {
+		// Complaints don't live in campaign_contact_progress — they
+		// arrive via deliverability_events. Count rows of type
+		// "complaint" pointing at this contact (either by contact_id
+		// or by recipient_email fallback for older rows).
+		complaintQuery := `
+			SELECT COUNT(*)
+			FROM deliverability_events
+			WHERE organization_id = $1
+			  AND event_type = 'complaint'
+			  AND (contact_id = $2 OR LOWER(recipient_email) = LOWER($3))
+		`
+		if err := r.DB.QueryRow(ctx, complaintQuery, *orgID, contactID, detail.Email).Scan(
+			&detail.Engagement.TotalComplained,
+		); err != nil {
+			db.CaptureError(err, complaintQuery, []any{*orgID, contactID, detail.Email}, "GetDetail complaints")
+			return nil, errx.InternalError()
+		}
+
+		// Suppression — there's at most one row per (org, email)
+		// thanks to the unique constraint.
+		suppQuery := `
+			SELECT reason, source, expires_at, created_at
+			FROM suppressed_recipients
+			WHERE organization_id = $1 AND LOWER(email) = LOWER($2)
+		`
+		var s models.ContactSuppression
+		err := r.DB.QueryRow(ctx, suppQuery, *orgID, detail.Email).Scan(
+			&s.Reason, &s.Source, &s.ExpiresAt, &s.CreatedAt,
+		)
+		switch {
+		case err == nil:
+			detail.Suppression = &s
+		case err == pgx.ErrNoRows:
+			// not suppressed; leave nil
+		default:
+			db.CaptureError(err, suppQuery, []any{*orgID, detail.Email}, "GetDetail suppression")
+			return nil, errx.InternalError()
+		}
+	}
+
+	return &detail, nil
+}
+
+// ListSentEmails returns one row per task we sent (or attempted to
+// send) to the contact, ordered by sent time DESC. Uses keyset
+// pagination on (created_at, task_id) so we can scroll through the
+// full history without blowing up offset.
+//
+// We deliberately scope by the contact's owning user via the
+// campaign join — this keeps multi-tenant safety even though the
+// tasks table itself has no user_id column.
+func (r *contactRepository) ListSentEmails(ctx context.Context, userID, contactID uuid.UUID, limit int, beforeSentAt *time.Time, beforeTaskID *uuid.UUID) (*models.ContactSentEmailsResult, *errx.Error) {
+	if limit <= 0 || limit > 200 {
+		limit = 50
+	}
+
+	args := []any{userID, contactID}
+	cursorClause := ""
+	if beforeSentAt != nil && beforeTaskID != nil {
+		cursorClause = "AND (t.created_at, t.id) < ($3, $4)"
+		args = append(args, *beforeSentAt, *beforeTaskID)
+	}
+	args = append(args, limit+1)
+
+	query := fmt.Sprintf(`
+		SELECT
+			t.id, t.status::text, t.message_id, t.created_at,
+			ea.id, ea.email, ea.name,
+			cam.id, cam.name,
+			seq.id, seq.name,
+			COALESCE(et.subject, seq.subject, '') AS subject,
+			ccp.opened_at, ccp.clicked_at, ccp.replied_at, ccp.bounced_at
+		FROM tasks t
+		JOIN campaign_tasks ct ON ct.task_id = t.id
+		LEFT JOIN email_accounts ea ON ea.id = t.email_account_id
+		LEFT JOIN campaigns cam     ON cam.id = ct.campaign_id
+		LEFT JOIN sequences seq     ON seq.id = ct.sequence_id
+		LEFT JOIN email_tasks et    ON et.task_id = t.id
+		LEFT JOIN campaign_contact_progress ccp
+			   ON ccp.campaign_id = ct.campaign_id
+			  AND ccp.contact_id  = ct.contact_id
+			  AND ccp.sequence_id = ct.sequence_id
+		WHERE ct.contact_id = $2
+		  AND cam.user_id   = $1
+		  %s
+		ORDER BY t.created_at DESC, t.id DESC
+		LIMIT $%d
+	`, cursorClause, len(args))
+
+	rows, err := r.DB.Query(ctx, query, args...)
+	if err != nil {
+		db.CaptureError(err, query, args, "ListSentEmails")
+		return nil, errx.InternalError()
+	}
+	defer rows.Close()
+
+	out := make([]models.ContactSentEmail, 0, limit)
+	for rows.Next() {
+		var e models.ContactSentEmail
+		if err := rows.Scan(
+			&e.TaskID, &e.Status, &e.MessageID, &e.SentAt,
+			&e.EmailAccountID, &e.EmailAccountEmail, &e.EmailAccountName,
+			&e.CampaignID, &e.CampaignName,
+			&e.SequenceID, &e.SequenceName,
+			&e.Subject,
+			&e.OpenedAt, &e.ClickedAt, &e.RepliedAt, &e.BouncedAt,
+		); err != nil {
+			db.CaptureError(err, "", nil, "ListSentEmails scan")
+			return nil, errx.InternalError()
+		}
+		out = append(out, e)
+	}
+
+	hasMore := false
+	var nextCursor *uuid.UUID
+	if len(out) > limit {
+		hasMore = true
+		nextCursor = &out[limit].TaskID
+		out = out[:limit]
+	}
+
+	return &models.ContactSentEmailsResult{
+		Data: out,
+		Pagination: models.Pagination{
+			NextCursor: nextCursor,
+			HasMore:    hasMore,
+		},
+	}, nil
+}
+
+// ListTimeline merges per-contact events from several source tables
+// into a single, reverse-chronological feed.
+//
+// Sources:
+//   - campaign_contact_progress       → sent / opened / clicked / replied / bounced
+//   - reply_intents                   → received replies (with intent classification)
+//   - deliverability_events           → bounce / complaint
+//   - suppressed_recipients           → suppression added
+//   - contact_notes                   → CRM notes
+//
+// We pull up to (limit) candidates from each source ordered by time
+// DESC, then merge-sort in Go. This avoids a 5-way UNION with
+// matching column lists (each source has a different shape), and the
+// per-source limit caps the read at roughly 5*limit rows.
+//
+// The `before` cursor is a wall-clock time; everything strictly older
+// than it is eligible. The caller paginates by setting `before` to
+// the oldest returned event's `At` on the next call.
+func (r *contactRepository) ListTimeline(ctx context.Context, userID uuid.UUID, orgID *uuid.UUID, contactID uuid.UUID, limit int, before *time.Time) (*models.ContactTimelineResult, *errx.Error) {
+	if limit <= 0 || limit > 200 {
+		limit = 50
+	}
+
+	// We resolve the contact's email up front because some org-scoped
+	// joins (suppression, deliverability fallback, reply_intents) key
+	// off email rather than contact_id.
+	var contactEmail string
+	if err := r.DB.QueryRow(ctx,
+		`SELECT email FROM contacts WHERE id = $1 AND user_id = $2`,
+		contactID, userID,
+	).Scan(&contactEmail); err != nil {
+		if err == pgx.ErrNoRows {
+			return nil, errx.ErrNotFound
+		}
+		db.CaptureError(err, "", nil, "ListTimeline contact email")
+		return nil, errx.InternalError()
+	}
+
+	// "before" defaults to "now + 1 minute" so the first page picks
+	// up everything. Using a future bound keeps the SQL uniform — every
+	// query passes the same predicate.
+	bound := time.Now().Add(time.Minute)
+	if before != nil {
+		bound = *before
+	}
+
+	events := make([]models.ContactTimelineEvent, 0, limit*2)
+
+	// 1. Engagement events from campaign_contact_progress. One progress
+	//    row can emit up to 5 events (sent/opened/clicked/replied/bounced).
+	progressQuery := `
+		SELECT
+			ccp.sent_at, ccp.opened_at, ccp.clicked_at, ccp.replied_at, ccp.bounced_at,
+			cam.id, cam.name,
+			seq.id, seq.name, seq.subject,
+			ea.id, ea.email, ea.name
+		FROM campaign_contact_progress ccp
+		JOIN campaigns cam ON cam.id = ccp.campaign_id
+		JOIN sequences seq ON seq.id = ccp.sequence_id
+		LEFT JOIN LATERAL (
+			SELECT ea.id, ea.email, ea.name
+			FROM   tasks t
+			JOIN   campaign_tasks ct ON ct.task_id = t.id
+			JOIN   email_accounts ea ON ea.id = t.email_account_id
+			WHERE  ct.campaign_id = ccp.campaign_id
+			  AND  ct.contact_id  = ccp.contact_id
+			  AND  ct.sequence_id = ccp.sequence_id
+			ORDER  BY t.created_at DESC
+			LIMIT  1
+		) ea ON TRUE
+		WHERE ccp.contact_id = $1
+		  AND cam.user_id    = $2
+		  AND COALESCE(ccp.sent_at, ccp.opened_at, ccp.clicked_at, ccp.replied_at, ccp.bounced_at) < $3
+		ORDER BY GREATEST(
+			COALESCE(ccp.sent_at,    'epoch'),
+			COALESCE(ccp.opened_at,  'epoch'),
+			COALESCE(ccp.clicked_at, 'epoch'),
+			COALESCE(ccp.replied_at, 'epoch'),
+			COALESCE(ccp.bounced_at, 'epoch')
+		) DESC
+		LIMIT $4
+	`
+	prows, err := r.DB.Query(ctx, progressQuery, contactID, userID, bound, limit)
+	if err != nil {
+		db.CaptureError(err, progressQuery, []any{contactID, userID, bound, limit}, "ListTimeline progress")
+		return nil, errx.InternalError()
+	}
+	for prows.Next() {
+		var sentAt, openedAt, clickedAt, repliedAt, bouncedAt *time.Time
+		var campID, seqID, eaID *uuid.UUID
+		var campName, seqName, seqSubject, eaEmail, eaName *string
+		if err := prows.Scan(
+			&sentAt, &openedAt, &clickedAt, &repliedAt, &bouncedAt,
+			&campID, &campName,
+			&seqID, &seqName, &seqSubject,
+			&eaID, &eaEmail, &eaName,
+		); err != nil {
+			prows.Close()
+			db.CaptureError(err, "", nil, "ListTimeline progress scan")
+			return nil, errx.InternalError()
+		}
+		baseSubject := seqSubject
+		makeEvent := func(t *time.Time, ty models.ContactTimelineEventType) {
+			if t == nil || !t.Before(bound) {
+				return
+			}
+			ev := models.ContactTimelineEvent{
+				Type:              ty,
+				At:                *t,
+				EmailAccountID:    eaID,
+				EmailAccountEmail: eaEmail,
+				EmailAccountName:  eaName,
+				CampaignID:        campID,
+				CampaignName:      campName,
+				SequenceID:        seqID,
+				SequenceName:      seqName,
+			}
+			if baseSubject != nil && *baseSubject != "" {
+				ev.Subject = baseSubject
+			}
+			events = append(events, ev)
+		}
+		makeEvent(sentAt, models.TimelineEmailSent)
+		makeEvent(openedAt, models.TimelineEmailOpened)
+		makeEvent(clickedAt, models.TimelineEmailClicked)
+		makeEvent(repliedAt, models.TimelineEmailReplied)
+		makeEvent(bouncedAt, models.TimelineEmailBounced)
+	}
+	prows.Close()
+
+	if orgID != nil {
+		// 2. Reply intents (inbound replies with classification).
+		replyQuery := `
+			SELECT ri.created_at, ri.intent, ri.campaign_id, cam.name, ri.task_id
+			FROM reply_intents ri
+			LEFT JOIN campaigns cam ON cam.id = ri.campaign_id
+			WHERE ri.organization_id = $1
+			  AND LOWER(ri.contact_email) = LOWER($2)
+			  AND ri.created_at < $3
+			ORDER BY ri.created_at DESC
+			LIMIT $4
+		`
+		rrows, err := r.DB.Query(ctx, replyQuery, *orgID, contactEmail, bound, limit)
+		if err != nil {
+			db.CaptureError(err, replyQuery, nil, "ListTimeline replies")
+			return nil, errx.InternalError()
+		}
+		for rrows.Next() {
+			var ev models.ContactTimelineEvent
+			var intent string
+			if err := rrows.Scan(&ev.At, &intent, &ev.CampaignID, &ev.CampaignName, &ev.TaskID); err != nil {
+				rrows.Close()
+				db.CaptureError(err, "", nil, "ListTimeline replies scan")
+				return nil, errx.InternalError()
+			}
+			ev.Type = models.TimelineReplyReceived
+			ev.Intent = &intent
+			events = append(events, ev)
+		}
+		rrows.Close()
+
+		// 3. Deliverability events (bounce / complaint / unsubscribe).
+		delivQuery := `
+			SELECT de.created_at, de.event_type, de.provider, de.reason,
+			       de.campaign_id, cam.name, de.task_id
+			FROM deliverability_events de
+			LEFT JOIN campaigns cam ON cam.id = de.campaign_id
+			WHERE de.organization_id = $1
+			  AND (de.contact_id = $2 OR LOWER(de.recipient_email) = LOWER($3))
+			  AND de.created_at < $4
+			ORDER BY de.created_at DESC
+			LIMIT $5
+		`
+		drows, err := r.DB.Query(ctx, delivQuery, *orgID, contactID, contactEmail, bound, limit)
+		if err != nil {
+			db.CaptureError(err, delivQuery, nil, "ListTimeline deliv")
+			return nil, errx.InternalError()
+		}
+		for drows.Next() {
+			var ev models.ContactTimelineEvent
+			var eventType, provider, reason string
+			if err := drows.Scan(&ev.At, &eventType, &provider, &reason, &ev.CampaignID, &ev.CampaignName, &ev.TaskID); err != nil {
+				drows.Close()
+				db.CaptureError(err, "", nil, "ListTimeline deliv scan")
+				return nil, errx.InternalError()
+			}
+			ev.Type = models.TimelineDeliverability
+			ev.Source = &eventType
+			ev.Provider = &provider
+			if reason != "" {
+				ev.Reason = &reason
+			}
+			events = append(events, ev)
+		}
+		drows.Close()
+
+		// 4. Suppression — emit one event at create time. We treat
+		//    later updates as the same event for now.
+		suppQuery := `
+			SELECT created_at, reason, source
+			FROM suppressed_recipients
+			WHERE organization_id = $1
+			  AND LOWER(email) = LOWER($2)
+			  AND created_at < $3
+			ORDER BY created_at DESC
+			LIMIT 1
+		`
+		var sAt time.Time
+		var sReason, sSource string
+		if err := r.DB.QueryRow(ctx, suppQuery, *orgID, contactEmail, bound).Scan(&sAt, &sReason, &sSource); err == nil {
+			ev := models.ContactTimelineEvent{
+				Type:   models.TimelineSuppressed,
+				At:     sAt,
+				Source: &sSource,
+			}
+			if sReason != "" {
+				ev.Reason = &sReason
+			}
+			events = append(events, ev)
+		} else if err != pgx.ErrNoRows {
+			db.CaptureError(err, suppQuery, nil, "ListTimeline suppression")
+			return nil, errx.InternalError()
+		}
+
+		// 5. Notes.
+		notesQuery := `
+			SELECT created_at, user_id, content
+			FROM contact_notes
+			WHERE contact_id = $1
+			  AND organization_id = $2
+			  AND created_at < $3
+			ORDER BY created_at DESC
+			LIMIT $4
+		`
+		nrows, err := r.DB.Query(ctx, notesQuery, contactID, *orgID, bound, limit)
+		if err != nil {
+			db.CaptureError(err, notesQuery, nil, "ListTimeline notes")
+			return nil, errx.InternalError()
+		}
+		for nrows.Next() {
+			var ev models.ContactTimelineEvent
+			var uid uuid.UUID
+			var content string
+			if err := nrows.Scan(&ev.At, &uid, &content); err != nil {
+				nrows.Close()
+				db.CaptureError(err, "", nil, "ListTimeline notes scan")
+				return nil, errx.InternalError()
+			}
+			ev.Type = models.TimelineNote
+			ev.UserID = &uid
+			ev.Content = &content
+			events = append(events, ev)
+		}
+		nrows.Close()
+	}
+
+	// Merge sort: newest first.
+	sort.Slice(events, func(i, j int) bool { return events[i].At.After(events[j].At) })
+
+	hasMore := false
+	if len(events) > limit {
+		hasMore = true
+		events = events[:limit]
+	}
+
+	return &models.ContactTimelineResult{
+		Data:    events,
+		HasMore: hasMore,
+	}, nil
+}