feat: add web push and sadhna tracker

migrations/0026_create_sadhna_rewards.up.sql

@@ -0,0 +1,36 @@
+-- Sādhana streak rewards.
+--
+-- `sadhna_rewards` is the catalog of gift items (one row per reward),
+-- seeded/synced at BFF startup from the embedded rewards.json so the
+-- name / meaning / image_url stay in lockstep with the source of truth.
+--
+-- `sadhna_reward_grants` records which reward a user earned at which
+-- streak milestone (a multiple of 7 days). The UNIQUE (user_id, milestone)
+-- makes granting idempotent — a milestone hands out exactly one gift no
+-- matter how often the dashboard is recomputed. `celebrated_at` is NULL
+-- until the client has shown the confetti celebration, so a freshly earned
+-- gift surfaces exactly once.
+CREATE TABLE IF NOT EXISTS sadhna_rewards (
+    id         UUID         PRIMARY KEY DEFAULT gen_random_uuid(),
+    key        TEXT         NOT NULL UNIQUE,
+    name       TEXT         NOT NULL,
+    meaning    TEXT         NOT NULL DEFAULT '',
+    image_url  TEXT         NOT NULL DEFAULT '',
+    active     BOOLEAN      NOT NULL DEFAULT TRUE,
+    sort       INTEGER      NOT NULL DEFAULT 0,
+    created_at TIMESTAMPTZ  NOT NULL DEFAULT now(),
+    updated_at TIMESTAMPTZ  NOT NULL DEFAULT now()
+);
+
+CREATE TABLE IF NOT EXISTS sadhna_reward_grants (
+    id            UUID         PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id       UUID         NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    reward_id     UUID         NOT NULL REFERENCES sadhna_rewards(id) ON DELETE CASCADE,
+    milestone     INTEGER      NOT NULL,
+    granted_at    TIMESTAMPTZ  NOT NULL DEFAULT now(),
+    celebrated_at TIMESTAMPTZ,
+    UNIQUE (user_id, milestone)
+);
+
+CREATE INDEX IF NOT EXISTS sadhna_reward_grants_user_idx
+    ON sadhna_reward_grants (user_id, granted_at DESC);