feat: db migration for workouts. still in progress

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

@@ -0,0 +1,3 @@
+DROP TABLE IF EXISTS template_exercises;
+DROP TABLE IF EXISTS templates;
+DROP TABLE IF EXISTS exercises;

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

@@ -0,0 +1,45 @@
+CREATE TABLE exercises (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    name TEXT NOT NULL,
+    equipment TEXT[] NOT NULL DEFAULT '{}'
+        CHECK (
+            equipment <@ ARRAY [
+                'floor',
+                'rings',
+                'pull_up_bar',
+                'dip_bars',
+                'parallettes',
+        ]::TEXT[]),
+    metric TEXT NOT NULL DEFAULT 'reps'
+        CHECK metric IN ('reps', 'seconds'),
+    load TEXT NOT NULL DEFAULT 'bodyweight'
+        CHECK load IN ('bodyweight', 'absolute'),
+    tags TEXT[] NOT NULL DEFAULT '{}', -- push/pull/legs/core/skill/shoulders/...
+    notes TEXT,
+    hidden NOT NULL DEFAULT FALSE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    modified_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE UNIQUE INDEX exercises_name_key ON exercises (lower(name));
+CREATE INDEX exercises_equipment_idx ON exercises USING gin (equipment);
+CREATE INDEX exercises_tags_idx ON exercises USING gin (tags);
+
+
+CREATE TABLE templates (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    name TEXT NOT NULL,
+    notes TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE template_exercises (
+    template_id UUID NOT NULL REFERENCES templates(id) ON DELETE CASCADE,
+    exercise_id UUID NOT NULL REFERENCES exercises(id) ON DELETE CASCADE,
+    position SMALLINT NOT NULL,
+    target TEXT,
+
+    PRIMARY KEY (template_id, exercise_id)
+);
+
+-- todo: workouts, sets