migration for tasks module and reward system

migrations/009_tasks-module.sql

@@ -0,0 +1,181 @@
+-- =====================================================================
+-- Migration 009: Tasks Module — Tasks with Reward System
+-- =====================================================================
+
+
+-- ---------------------------------------------------------------------
+-- Block 1: Tasks Table
+-- Stores community Tasks with Geometry, Moderation and Completion.
+-- Status Flow: pending → rejected | open → completed → verified
+-- ---------------------------------------------------------------------
+CREATE TABLE IF NOT EXISTS tasks (
+    task_id              SERIAL PRIMARY KEY,
+    municipality_id      INTEGER NOT NULL REFERENCES municipalities(municipality_id),
+    geom                 GEOMETRY(Geometry, 4326) NOT NULL,
+    geom_type            VARCHAR(10) NOT NULL CHECK (geom_type IN ('point', 'line', 'polygon')),
+    category             VARCHAR(50) NOT NULL,
+    title                VARCHAR(200) NOT NULL,
+    description          TEXT DEFAULT '',
+    points_reward        INTEGER NOT NULL DEFAULT 25,
+    author_name          VARCHAR(100) NOT NULL,
+    browser_id           VARCHAR(36),
+    photo_path           VARCHAR(255),
+    status               VARCHAR(20) NOT NULL DEFAULT 'pending'
+                         CHECK (status IN ('pending', 'rejected', 'open', 'completed', 'verified')),
+    address              VARCHAR(255),
+
+    -- Completion Fields (NULL until completed)
+    completed_by_name    VARCHAR(100),
+    completed_by_browser VARCHAR(36),
+    completion_photo     VARCHAR(255),
+    completion_comment   TEXT,
+    completed_at         TIMESTAMP,
+
+    -- Counters (updated via Triggers)
+    likes_count          INTEGER NOT NULL DEFAULT 0,
+    dislikes_count       INTEGER NOT NULL DEFAULT 0,
+    comment_count        INTEGER NOT NULL DEFAULT 0,
+
+    created_at           TIMESTAMP NOT NULL DEFAULT NOW(),
+    updated_at           TIMESTAMP NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX idx_tasks_municipality ON tasks(municipality_id);
+CREATE INDEX idx_tasks_status ON tasks(status);
+CREATE INDEX idx_tasks_category ON tasks(category);
+
+
+-- ---------------------------------------------------------------------
+-- Block 2: User Points Table
+-- One Entry per verified Task Completion. Leaderboard via SUM/GROUP BY.
+-- ---------------------------------------------------------------------
+CREATE TABLE IF NOT EXISTS user_points (
+    points_id            SERIAL PRIMARY KEY,
+    municipality_id      INTEGER NOT NULL REFERENCES municipalities(municipality_id),
+    user_name            VARCHAR(100) NOT NULL,
+    points               INTEGER NOT NULL DEFAULT 25,
+    task_id              INTEGER NOT NULL REFERENCES tasks(task_id) ON DELETE CASCADE,
+    created_at           TIMESTAMP NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX idx_user_points_municipality ON user_points(municipality_id);
+CREATE INDEX idx_user_points_user ON user_points(user_name);
+
+
+-- ---------------------------------------------------------------------
+-- Block 3: Extends Votes Table for Tasks
+-- Either contribution_id OR task_id is set, not both.
+-- ---------------------------------------------------------------------
+ALTER TABLE votes
+    ADD COLUMN task_id INTEGER REFERENCES tasks(task_id) ON DELETE CASCADE;
+
+CREATE INDEX idx_votes_task ON votes(task_id);
+
+-- Unique Vote per Browser per Task
+ALTER TABLE votes
+    ADD CONSTRAINT votes_task_browser_unique
+    UNIQUE (task_id, browser_id);
+
+
+-- ---------------------------------------------------------------------
+-- Block 4: Extends Comments Table for Tasks
+-- Either contribution_id OR task_id is set, not both.
+-- ---------------------------------------------------------------------
+ALTER TABLE comments
+    ADD COLUMN task_id INTEGER REFERENCES tasks(task_id) ON DELETE CASCADE;
+
+CREATE INDEX idx_comments_task ON comments(task_id);
+
+
+-- ---------------------------------------------------------------------
+-- Block 5: Trigger — updated_at Timestamp for Tasks
+-- ---------------------------------------------------------------------
+CREATE TRIGGER set_tasks_updated_at
+    BEFORE UPDATE ON tasks
+    FOR EACH ROW
+    EXECUTE FUNCTION set_updated_at();
+
+
+-- ---------------------------------------------------------------------
+-- Block 6: Trigger — Vote Counts for Tasks
+-- Mirrors the Pattern from Contributions.
+-- ---------------------------------------------------------------------
+CREATE OR REPLACE FUNCTION update_task_vote_counts()
+RETURNS TRIGGER AS $$
+BEGIN
+    IF TG_OP = 'INSERT' OR TG_OP = 'UPDATE' THEN
+        IF NEW.task_id IS NOT NULL THEN
+            UPDATE tasks SET
+                likes_count = (SELECT COUNT(*) FROM votes WHERE task_id = NEW.task_id AND vote_type = 'like'),
+                dislikes_count = (SELECT COUNT(*) FROM votes WHERE task_id = NEW.task_id AND vote_type = 'dislike')
+            WHERE task_id = NEW.task_id;
+        END IF;
+    END IF;
+
+    IF TG_OP = 'DELETE' OR (TG_OP = 'UPDATE' AND OLD.task_id IS NOT NULL) THEN
+        UPDATE tasks SET
+            likes_count = (SELECT COUNT(*) FROM votes WHERE task_id = OLD.task_id AND vote_type = 'like'),
+            dislikes_count = (SELECT COUNT(*) FROM votes WHERE task_id = OLD.task_id AND vote_type = 'dislike')
+        WHERE task_id = OLD.task_id;
+    END IF;
+
+    RETURN NULL;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trigger_update_task_vote_counts
+    AFTER INSERT OR DELETE OR UPDATE ON votes
+    FOR EACH ROW
+    WHEN (NEW.task_id IS NOT NULL OR OLD.task_id IS NOT NULL)
+    EXECUTE FUNCTION update_task_vote_counts();
+
+
+-- ---------------------------------------------------------------------
+-- Block 7: Trigger — Comment Count for Tasks
+-- Only counts approved Comments. Mirrors Contribution Pattern.
+-- ---------------------------------------------------------------------
+CREATE OR REPLACE FUNCTION update_task_comment_count()
+RETURNS TRIGGER AS $$
+BEGIN
+    IF TG_OP = 'INSERT' OR TG_OP = 'UPDATE' THEN
+        IF NEW.task_id IS NOT NULL THEN
+            UPDATE tasks
+            SET comment_count = (
+                SELECT COUNT(*) FROM comments
+                WHERE task_id = NEW.task_id AND status = 'approved'
+            )
+            WHERE task_id = NEW.task_id;
+        END IF;
+    END IF;
+
+    IF TG_OP = 'DELETE' OR (TG_OP = 'UPDATE' AND OLD.task_id IS NOT NULL) THEN
+        UPDATE tasks
+        SET comment_count = (
+            SELECT COUNT(*) FROM comments
+            WHERE task_id = OLD.task_id AND status = 'approved'
+        )
+        WHERE task_id = OLD.task_id;
+    END IF;
+
+    RETURN NULL;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trigger_update_task_comment_count
+    AFTER INSERT OR DELETE OR UPDATE OF status ON comments
+    FOR EACH ROW
+    WHEN (NEW.task_id IS NOT NULL OR OLD.task_id IS NOT NULL)
+    EXECUTE FUNCTION update_task_comment_count();
+
+
+-- ---------------------------------------------------------------------
+-- Block 8: Views for QGIS (optional)
+-- ---------------------------------------------------------------------
+CREATE OR REPLACE VIEW tasks_points AS
+    SELECT * FROM tasks WHERE geom_type = 'point';
+
+CREATE OR REPLACE VIEW tasks_lines AS
+    SELECT * FROM tasks WHERE geom_type = 'line';
+
+CREATE OR REPLACE VIEW tasks_polygons AS
+    SELECT * FROM tasks WHERE geom_type = 'polygon';