feat: add web push and sadhna tracker

internal/repository/post_repo.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"time"
 
 	"github.com/jackc/pgx/v5"
 	"github.com/prabhupadasays/spsays-bff/internal/model"
@@ -215,6 +216,65 @@ func (r *PostRepo) CountByUser(ctx context.Context, userID string) (int, error)
 	return n, nil
 }
 
+// PostedDates returns the set of UTC calendar days, on or after `since`,
+// on which the user created at least one post. Used by the sādhana streak
+// to detect the "posted a quote today" discipline (and to score past days
+// of the streak) without loading whole posts. Keys are "YYYY-MM-DD".
+func (r *PostRepo) PostedDates(ctx context.Context, userID string, since time.Time) (map[string]bool, error) {
+	rows, err := r.pg.Pool.Query(ctx, `
+		SELECT DISTINCT (created_at AT TIME ZONE 'UTC')::date AS d
+		FROM posts
+		WHERE user_id = $1 AND created_at >= $2`,
+		userID, since,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("posted dates: %w", err)
+	}
+	defer rows.Close()
+
+	out := make(map[string]bool)
+	for rows.Next() {
+		var d time.Time
+		if err := rows.Scan(&d); err != nil {
+			return nil, fmt.Errorf("scan posted date: %w", err)
+		}
+		out[d.Format("2006-01-02")] = true
+	}
+	return out, rows.Err()
+}
+
+// PostCountsByDate returns, for each UTC calendar day on or after `since`,
+// how many posts the user created that day. Keys are "YYYY-MM-DD"; days
+// with no posts are absent (so a missing key reads as zero). The sādhana
+// vine uses this both for the "posted a quote today" discipline and to
+// annotate each day's fold with the number of quotes shared.
+func (r *PostRepo) PostCountsByDate(ctx context.Context, userID string, since time.Time) (map[string]int, error) {
+	rows, err := r.pg.Pool.Query(ctx, `
+		SELECT (created_at AT TIME ZONE 'UTC')::date AS d, count(*) AS n
+		FROM posts
+		WHERE user_id = $1 AND created_at >= $2
+		GROUP BY d`,
+		userID, since,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("post counts by date: %w", err)
+	}
+	defer rows.Close()
+
+	out := make(map[string]int)
+	for rows.Next() {
+		var (
+			d time.Time
+			n int
+		)
+		if err := rows.Scan(&d, &n); err != nil {
+			return nil, fmt.Errorf("scan post count: %w", err)
+		}
+		out[d.Format("2006-01-02")] = n
+	}
+	return out, rows.Err()
+}
+
 // Reshare creates a new posts row owned by `resharerID` that points at
 // the canonical original via `reshared_from_post_id`. Copies the
 // original's caption / source_url / source_title and its current images