feat: added workouts and workout_sets db tables

internal/database/migrations/000003_create_workouts.down.sql

@@ -1,3 +1,5 @@
+DROP TABLE IF EXISTS workout_sets;
+DROP TABLE IF EXISTS workouts;
 DROP TABLE IF EXISTS template_exercises;
 DROP TABLE IF EXISTS templates;
 DROP TABLE IF EXISTS exercises;

internal/database/migrations/000003_create_workouts.up.sql

@@ -9,6 +9,7 @@ CREATE TABLE exercises (
                 'pull_up_bar',
                 'dip_bars',
                 'parallettes',
+                'resistance_band'
         ]::TEXT[]),
     metric TEXT NOT NULL DEFAULT 'reps'
         CHECK metric IN ('reps', 'seconds'),
@@ -42,4 +43,33 @@ CREATE TABLE template_exercises (
     PRIMARY KEY (template_id, exercise_id)
 );
 
--- todo: workouts, sets
+
+CREATE TABLE workouts (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    name TEXT NOT NULL,
+    template_id UUID REFERENCES templates(id) ON DELETE SET NULL,
+    started_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    ended_at TIMESTAMPTZ,
+    rpe smallint CHECK (rpe BETWEEN 1 AND 10),
+    bodyweight_kg NUMERIC(5,2),
+    notes TEXT
+);
+
+CREATE INDEX workouts_time_idx ON workouts (started_at DESC);
+
+
+CREATE TABLE workout_sets (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    workout_id UUID NOT NULL REFERENCES workouts(id) ON DELETE CASCADE,
+    exercise_id UUID NOT NULL REFERENCES exercises(id) ON DELETE RESTRICT,
+    logged_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    reps SMALLINT,
+    seconds SMALLINT,
+    weight_kg NUMERIC(5,2),
+    note TEXT,
+
+    CONSTRAINT set_has_number CHECK (reps IS NOT NULL OR seconds IS NOT NULL)
+);
+
+CREATE INDEX sets_workout_idx ON workout_sets (workout_id, logged_at);
+CREATE INDEX sets_exercise_ifx ON workout_sets (exercise_id, logged_at DESC);