Images and Image Meta data, with Controllers and repos

sql/ImageMetaManagement.sql

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+-- Auto-update updated_at on UPDATE (PostgreSQL)
+
+-- 1) Generic trigger function
+CREATE OR REPLACE FUNCTION set_updated_at()
+RETURNS TRIGGER AS $$
+BEGIN
+  NEW.updated_at = NOW();
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+-- 2) Tables
+CREATE TABLE IF NOT EXISTS image_meta (
+    id            BIGSERIAL PRIMARY KEY,
+    original_name TEXT,
+    content_type  TEXT NOT NULL,
+    byte_size     BIGINT NOT NULL CHECK (byte_size >= 0),
+    sha256        CHAR(64),
+
+    created_at    TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at    TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    deleted_at    TIMESTAMPTZ NULL
+);
+
+CREATE TABLE IF NOT EXISTS image_blob (
+    image_id     BIGINT PRIMARY KEY,
+    data         BYTEA NOT NULL,
+
+    created_at   TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at   TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    deleted_at   TIMESTAMPTZ NULL,
+
+    CONSTRAINT fk_image_blob_meta
+        FOREIGN KEY (image_id)
+        REFERENCES image_meta(id)
+        ON DELETE CASCADE
+);
+
+-- 3) Triggers (drop first to make script re-runnable)
+DROP TRIGGER IF EXISTS trg_image_meta_set_updated_at ON image_meta;
+CREATE TRIGGER trg_image_meta_set_updated_at
+BEFORE UPDATE ON image_meta
+FOR EACH ROW
+EXECUTE FUNCTION set_updated_at();
+
+DROP TRIGGER IF EXISTS trg_image_blob_set_updated_at ON image_blob;
+CREATE TRIGGER trg_image_blob_set_updated_at
+BEFORE UPDATE ON image_blob
+FOR EACH ROW
+EXECUTE FUNCTION set_updated_at();
+
+-- 4) Helpful indexes
+CREATE INDEX IF NOT EXISTS idx_image_meta_created_at ON image_meta(created_at);
+CREATE INDEX IF NOT EXISTS idx_image_meta_sha256 ON image_meta(sha256);
+CREATE INDEX IF NOT EXISTS idx_image_meta_deleted_at ON image_meta(deleted_at);
+CREATE INDEX IF NOT EXISTS idx_image_blob_deleted_at ON image_blob(deleted_at);